creation_sourcecode: {{
    "language": "Solidity",
    "sources": {
      "FictZero.sol": {
        "content": "// SPDX-License-Identifier: MIT\r\n\r\npragma solidity 0.8.20;\r\n\r\nimport \"@openzeppelin/contracts/access/Ownable.sol\";\r\nimport \"@openzeppelin/contracts/utils/cryptography/ECDSA.sol\";\r\nimport {ERC721, IERC721} from \"@openzeppelin/contracts/token/ERC721/ERC721.sol\";\r\nimport \"@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol\";\r\n\r\ncontract FICTZERO is ERC721, ERC721Enumerable, Ownable {\r\n    using ECDSA for bytes32;\r\n\r\n    address private signerAddress = 0x4Ca9936072B171a08301b59446F34bC0F3CF9f4B;\r\n    string private tokenBaseURI;\r\n    bool public isMintLive = false;\r\n    uint256 private nextTokenId = 1;\r\n    uint256 public reservePrice = 0.8 ether;\r\n    uint256 public mintPrice = 1 ether;\r\n    uint256 public maxSupply = 888;\r\n    uint256 public rewardEnd = block.timestamp;\r\n\r\n    struct maxMintPerYear {\r\n        uint256 maxSupply;\r\n        uint256 count;\r\n    }\r\n\r\n    struct StakeInfo {\r\n        address staker;\r\n        uint256 stakeStarted;\r\n        uint256 stakeEnded;\r\n        uint256 duration;\r\n    }\r\n\r\n    mapping(uint256 => bool) public isClaimed;\r\n    mapping(address => bool) public isMinted;\r\n    mapping(uint256 => StakeInfo) public isStaked;\r\n    mapping(uint256 => maxMintPerYear) public counterMaxMint;\r\n\r\n    event MintPriceChanged(address indexed _from, uint256 _value);\r\n    event ReservePriceChanged(address indexed _from, uint256 _value);\r\n    event MintToggled(address indexed _from, bool _value);\r\n    event MintRegistered(\r\n        address indexed _from,\r\n        uint256 _value,\r\n        uint256 _tokenId\r\n    );\r\n    event SignerAddressChanged(\r\n        address indexed _from,\r\n        address _to,\r\n        address _oldAddress\r\n    );\r\n    event RewardClaimed(\r\n        address indexed _from,\r\n        uint256 _value,\r\n        uint256 _tokenId\r\n    );\r\n    event Stake(uint256 indexed _tokenId);\r\n    event Unstake(uint256 indexed tokenId, uint256 stakedAtTimestamp, uint256 removedFromStakeAtTimestamp);\r\n\r\n    constructor(address _deployer, string memory _tokenURI)\r\n        ERC721(\"FICTZERO\", \"FICTZERO\")\r\n    {\r\n        transferOwnership(_deployer);\r\n        tokenBaseURI = _tokenURI;\r\n        counterMaxMint[2024].maxSupply = 333;\r\n        counterMaxMint[2025].maxSupply = 222;\r\n        counterMaxMint[2026].maxSupply = 111;\r\n        counterMaxMint[2027].maxSupply = 99;\r\n        counterMaxMint[2028].maxSupply = 88;\r\n        counterMaxMint[2029].maxSupply = 77;\r\n        counterMaxMint[2030].maxSupply = 55;\r\n        counterMaxMint[2031].maxSupply = 33;\r\n        counterMaxMint[2032].maxSupply = 22;\r\n        counterMaxMint[2033].maxSupply = 11;\r\n    }\r\n\r\n    modifier checkSigned(\r\n        address _address,\r\n        uint256 _nonce,\r\n        uint256 _price,\r\n        bytes32 _messageHash,\r\n        bytes memory _signature,\r\n        uint256 _stakeDuration\r\n    ) {\r\n        require(\r\n            _messageHash ==\r\n                ECDSA.toEthSignedMessageHash(\r\n                    hashPacked(_address, _nonce, _price, _stakeDuration)\r\n                ),\r\n            \"Invalid message hash\"\r\n        );\r\n        require(\r\n            signerAddress == ECDSA.recover(_messageHash, _signature),\r\n            \"Invalid signature\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    modifier stakeSigned(\r\n        address _address,\r\n        uint256 _nonce,\r\n        bytes32 _messageHash,\r\n        bytes memory _signature,\r\n        uint256 _stakeDuration\r\n    ) {\r\n        require(\r\n            _messageHash ==\r\n                ECDSA.toEthSignedMessageHash(\r\n                    hashStakePacked(_address, _nonce, _stakeDuration)\r\n                ),\r\n            \"Invalid message hash\"\r\n        );\r\n        require(\r\n            signerAddress == ECDSA.recover(_messageHash, _signature),\r\n            \"Invalid signature\"\r\n        );\r\n        _;\r\n    }\r\n\r\n    modifier isNotStaked(uint256 _tokenId) {\r\n        require(isStaked[_tokenId].duration < 1, \"Token is Staked\");\r\n        _;\r\n    }\r\n\r\n    modifier isNotUnStaked(uint256 _tokenId) {\r\n        require(isStaked[_tokenId].duration > 0, \"Token is Unstaked\");\r\n        _;\r\n    }\r\n\r\n    function toggleMint() external onlyOwner {\r\n        isMintLive = !isMintLive;\r\n        emit MintToggled(msg.sender, isMintLive);\r\n    }\r\n\r\n    function setMintPrice(uint256 _mintPrice) external onlyOwner {\r\n        mintPrice = _mintPrice;\r\n        emit MintPriceChanged(msg.sender, mintPrice);\r\n    }\r\n\r\n    function setReservePrice(uint256 _reservePrice) external onlyOwner {\r\n        reservePrice = _reservePrice;\r\n        emit ReservePriceChanged(msg.sender, reservePrice);\r\n    }\r\n\r\n    function setRewardEnd(uint256 _rewardEnd) external onlyOwner {\r\n        rewardEnd = _rewardEnd;\r\n    }\r\n\r\n    function mintFictZero(\r\n        uint256 _nonce,\r\n        bytes32 _msgHash,\r\n        bytes memory _signature,\r\n        uint256 _stakeDuration\r\n    )\r\n        external\r\n        payable\r\n        checkSigned(\r\n            msg.sender,\r\n            _nonce,\r\n            msg.value,\r\n            _msgHash,\r\n            _signature,\r\n            _stakeDuration\r\n        )\r\n    {\r\n        require(isMintLive, \"Mint is not live yet\");\r\n        require(!isMinted[msg.sender], \"You already Minted!\");\r\n        require(nextTokenId <= maxSupply, \"Fict Zero is minted out\");\r\n        require(msg.value == reservePrice || msg.value == mintPrice, \"Price does not match\");\r\n        uint256 currentYear = (block.timestamp / 31557600) + 1970;\r\n        if (currentYear < 2034) {\r\n            require(\r\n                counterMaxMint[currentYear].count <\r\n                    counterMaxMint[currentYear].maxSupply,\r\n                \"Supply already exceed for this year\"\r\n            );\r\n        }\r\n\r\n        uint256 tokenId = nextTokenId++;\r\n        _safeMint(msg.sender, tokenId);\r\n        stakeHelper(_stakeDuration, tokenId);\r\n        counterMaxMint[currentYear].count++;\r\n        unchecked {\r\n            isMinted[msg.sender] = true;\r\n            emit MintRegistered(msg.sender, msg.value, tokenId);\r\n        }\r\n    }\r\n\r\n    function stakeFictZero(\r\n        uint256 _tokenId,\r\n        uint256 _nonce,\r\n        bytes32 _msgHash,\r\n        bytes memory _signature,\r\n        uint256 _daysValue\r\n    )\r\n        external\r\n        stakeSigned(msg.sender, _nonce, _msgHash, _signature, _daysValue)\r\n        isNotStaked(_tokenId)\r\n    {\r\n        require(ownerOf(_tokenId) == msg.sender, \"Not Token Owner\");\r\n\r\n        stakeHelper(_daysValue, _tokenId);\r\n    }\r\n\r\n    function unstakeFictZero(uint256 _tokenId)\r\n        external\r\n        isNotUnStaked(_tokenId)\r\n    {\r\n        require(ownerOf(_tokenId) == msg.sender, \"Not Token Owner\");\r\n        require(\r\n            block.timestamp > isStaked[_tokenId].stakeEnded,\r\n            \"Token still on stake period\"\r\n        );\r\n        unchecked {\r\n            uint256 stakedAt = isStaked[_tokenId].stakeStarted;\r\n            delete isStaked[_tokenId];\r\n            emit Unstake(_tokenId, stakedAt, block.timestamp);\r\n        }\r\n    }\r\n\r\n    function setSignerAddress(address _newSigner) external onlyOwner {\r\n        require(_newSigner != address(0), \"Address is not valid!\");\r\n        address oldAddress = signerAddress;\r\n        signerAddress = _newSigner;\r\n        emit SignerAddressChanged(msg.sender, signerAddress, oldAddress);\r\n    }\r\n\r\n    function _baseURI() internal view virtual override returns (string memory) {\r\n        return tokenBaseURI;\r\n    }\r\n\r\n    function stakeHelper(uint256 _daysValue, uint256 _tokenId) internal {\r\n        uint256 _reward = 0;\r\n        if (_daysValue > 0) {\r\n            isStaked[_tokenId].staker = msg.sender;\r\n            isStaked[_tokenId].stakeStarted = block.timestamp;\r\n            isStaked[_tokenId].stakeEnded = block.timestamp + (_daysValue * 86400); // convert from days 60 * 60 * 24\r\n            isStaked[_tokenId].duration = _daysValue;\r\n            emit Stake(_tokenId);\r\n            if (block.timestamp < rewardEnd && !isClaimed[_tokenId]) {\r\n                if (_daysValue == 180) {\r\n                    _reward = 0;\r\n                } else if (_daysValue == 360) {\r\n                    _reward = 0.4 ether;\r\n                } else if (_daysValue == 540) {\r\n                    _reward = 0.6 ether;\r\n                } else if (_daysValue == 720) {\r\n                    _reward = 0.8 ether;\r\n                } else if (_daysValue == 900) {\r\n                    _reward = 1 ether;\r\n                }\r\n                isClaimed[_tokenId] = true;\r\n                if (_reward > 0) {\r\n                    (bool succ, ) = payable(msg.sender).call{value: _reward}(\r\n                        \"\"\r\n                    );\r\n                    require(succ, \"transfer failed\");\r\n                    emit RewardClaimed(msg.sender, _reward, _tokenId);\r\n                }\r\n            }\r\n        }\r\n    }\r\n\r\n    function setBaseURI(string memory baseURI) external onlyOwner {\r\n        tokenBaseURI = baseURI;\r\n    }\r\n\r\n    function hashPacked(\r\n        address _address,\r\n        uint256 _nonce,\r\n        uint256 _price,\r\n        uint256 _stakeDuration\r\n    ) private pure returns (bytes32) {\r\n        bytes memory hashData = abi.encodePacked(\r\n            _address,\r\n            _nonce,\r\n            _price,\r\n            _stakeDuration\r\n        );\r\n        bytes32 hash = keccak256(hashData);\r\n        return hash;\r\n    }\r\n\r\n    function hashStakePacked(\r\n        address _address,\r\n        uint256 _nonce,\r\n        uint256 _stakeDuration\r\n    ) private pure returns (bytes32) {\r\n        bytes memory hashData = abi.encodePacked(\r\n            _address,\r\n            _nonce,\r\n            _stakeDuration\r\n        );\r\n        bytes32 hash = keccak256(hashData);\r\n        return hash;\r\n    }\r\n\r\n    function safeTransferFrom(\r\n        address from,\r\n        address to,\r\n        uint256 tokenId,\r\n        bytes memory data\r\n    ) public virtual override(ERC721, IERC721) isNotStaked(tokenId) {\r\n        super.safeTransferFrom(from, to, tokenId, data);\r\n    }\r\n\r\n    function transferFrom(\r\n        address from,\r\n        address to,\r\n        uint256 tokenId\r\n    ) public virtual override(ERC721, IERC721) isNotStaked(tokenId) {\r\n        super.transferFrom(from, to, tokenId);\r\n    }\r\n\r\n    // The following functions are overrides required by Solidity.\r\n\r\n    function _update(\r\n        address to,\r\n        uint256 tokenId,\r\n        address auth\r\n    ) internal override(ERC721, ERC721Enumerable) returns (address) {\r\n        return super._update(to, tokenId, auth);\r\n    }\r\n\r\n    function _increaseBalance(address account, uint128 value)\r\n        internal\r\n        override(ERC721, ERC721Enumerable)\r\n    {\r\n        super._increaseBalance(account, value);\r\n    }\r\n\r\n    function supportsInterface(bytes4 interfaceId)\r\n        public\r\n        view\r\n        override(ERC721, ERC721Enumerable)\r\n        returns (bool)\r\n    {\r\n        return super.supportsInterface(interfaceId);\r\n    }\r\n\r\n    function deposit() external payable onlyOwner {}\r\n\r\n    function withdraw() external onlyOwner {\r\n        (bool succ, ) = payable(msg.sender).call{value: address(this).balance}(\r\n            \"\"\r\n        );\r\n        require(succ, \"transfer failed\");\r\n    }\r\n}\r\n"
      },
      "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/extensions/ERC721Enumerable.sol)\n\npragma solidity ^0.8.20;\n\nimport {ERC721} from \"../ERC721.sol\";\nimport {IERC721Enumerable} from \"./IERC721Enumerable.sol\";\nimport {IERC165} from \"../../../utils/introspection/ERC165.sol\";\n\n/**\n * @dev This implements an optional extension of {ERC721} defined in the EIP that adds enumerability\n * of all the token ids in the contract as well as all token ids owned by each account.\n *\n * CAUTION: `ERC721` extensions that implement custom `balanceOf` logic, such as `ERC721Consecutive`,\n * interfere with enumerability and should not be used together with `ERC721Enumerable`.\n */\nabstract contract ERC721Enumerable is ERC721, IERC721Enumerable {\n    mapping(address owner => mapping(uint256 index => uint256)) private _ownedTokens;\n    mapping(uint256 tokenId => uint256) private _ownedTokensIndex;\n\n    uint256[] private _allTokens;\n    mapping(uint256 tokenId => uint256) private _allTokensIndex;\n\n    /**\n     * @dev An `owner`'s token query was out of bounds for `index`.\n     *\n     * NOTE: The owner being `address(0)` indicates a global out of bounds index.\n     */\n    error ERC721OutOfBoundsIndex(address owner, uint256 index);\n\n    /**\n     * @dev Batch mint is not allowed.\n     */\n    error ERC721EnumerableForbiddenBatchMint();\n\n    /**\n     * @dev See {IERC165-supportsInterface}.\n     */\n    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {\n        return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);\n    }\n\n    /**\n     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.\n     */\n    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual returns (uint256) {\n        if (index >= balanceOf(owner)) {\n            revert ERC721OutOfBoundsIndex(owner, index);\n        }\n        return _ownedTokens[owner][index];\n    }\n\n    /**\n     * @dev See {IERC721Enumerable-totalSupply}.\n     */\n    function totalSupply() public view virtual returns (uint256) {\n        return _allTokens.length;\n    }\n\n    /**\n     * @dev See {IERC721Enumerable-tokenByIndex}.\n     */\n    function tokenByIndex(uint256 index) public view virtual returns (uint256) {\n        if (index >= totalSupply()) {\n            revert ERC721OutOfBoundsIndex(address(0), index);\n        }\n        return _allTokens[index];\n    }\n\n    /**\n     * @dev See {ERC721-_update}.\n     */\n    function _update(address to, uint256 tokenId, address auth) internal virtual override returns (address) {\n        address previousOwner = super._update(to, tokenId, auth);\n\n        if (previousOwner == address(0)) {\n            _addTokenToAllTokensEnumeration(tokenId);\n        } else if (previousOwner != to) {\n            _removeTokenFromOwnerEnumeration(previousOwner, tokenId);\n        }\n        if (to == address(0)) {\n            _removeTokenFromAllTokensEnumeration(tokenId);\n        } else if (previousOwner != to) {\n            _addTokenToOwnerEnumeration(to, tokenId);\n        }\n\n        return previousOwner;\n    }\n\n    /**\n     * @dev Private function to add a token to this extension's ownership-tracking data structures.\n     * @param to address representing the new owner of the given token ID\n     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address\n     */\n    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {\n        uint256 length = balanceOf(to) - 1;\n        _ownedTokens[to][length] = tokenId;\n        _ownedTokensIndex[tokenId] = length;\n    }\n\n    /**\n     * @dev Private function to add a token to this extension's token tracking data structures.\n     * @param tokenId uint256 ID of the token to be added to the tokens list\n     */\n    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {\n        _allTokensIndex[tokenId] = _allTokens.length;\n        _allTokens.push(tokenId);\n    }\n\n    /**\n     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that\n     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for\n     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).\n     * This has O(1) time complexity, but alters the order of the _ownedTokens array.\n     * @param from address representing the previous owner of the given token ID\n     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address\n     */\n    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {\n        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and\n        // then delete the last slot (swap and pop).\n\n        uint256 lastTokenIndex = balanceOf(from);\n        uint256 tokenIndex = _ownedTokensIndex[tokenId];\n\n        // When the token to delete is the last token, the swap operation is unnecessary\n        if (tokenIndex != lastTokenIndex) {\n            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];\n\n            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token\n            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index\n        }\n\n        // This also deletes the contents at the last position of the array\n        delete _ownedTokensIndex[tokenId];\n        delete _ownedTokens[from][lastTokenIndex];\n    }\n\n    /**\n     * @dev Private function to remove a token from this extension's token tracking data structures.\n     * This has O(1) time complexity, but alters the order of the _allTokens array.\n     * @param tokenId uint256 ID of the token to be removed from the tokens list\n     */\n    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {\n        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and\n        // then delete the last slot (swap and pop).\n\n        uint256 lastTokenIndex = _allTokens.length - 1;\n        uint256 tokenIndex = _allTokensIndex[tokenId];\n\n        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so\n        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding\n        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)\n        uint256 lastTokenId = _allTokens[lastTokenIndex];\n\n        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token\n        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index\n\n        // This also deletes the contents at the last position of the array\n        delete _allTokensIndex[tokenId];\n        _allTokens.pop();\n    }\n\n    /**\n     * See {ERC721-_increaseBalance}. We need that to account tokens that were minted in batch\n     */\n    function _increaseBalance(address account, uint128 amount) internal virtual override {\n        if (amount > 0) {\n            revert ERC721EnumerableForbiddenBatchMint();\n        }\n        super._increaseBalance(account, amount);\n    }\n}\n"
      },
      "@openzeppelin/contracts/token/ERC721/ERC721.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/ERC721.sol)\n\npragma solidity ^0.8.20;\n\nimport {IERC721} from \"./IERC721.sol\";\nimport {IERC721Receiver} from \"./IERC721Receiver.sol\";\nimport {IERC721Metadata} from \"./extensions/IERC721Metadata.sol\";\nimport {Context} from \"../../utils/Context.sol\";\nimport {Strings} from \"../../utils/Strings.sol\";\nimport {IERC165, ERC165} from \"../../utils/introspection/ERC165.sol\";\nimport {IERC721Errors} from \"../../interfaces/draft-IERC6093.sol\";\n\n/**\n * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including\n * the Metadata extension, but not including the Enumerable extension, which is available separately as\n * {ERC721Enumerable}.\n */\nabstract contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Errors {\n    using Strings for uint256;\n\n    // Token name\n    string private _name;\n\n    // Token symbol\n    string private _symbol;\n\n    mapping(uint256 tokenId => address) private _owners;\n\n    mapping(address owner => uint256) private _balances;\n\n    mapping(uint256 tokenId => address) private _tokenApprovals;\n\n    mapping(address owner => mapping(address operator => bool)) private _operatorApprovals;\n\n    /**\n     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.\n     */\n    constructor(string memory name_, string memory symbol_) {\n        _name = name_;\n        _symbol = symbol_;\n    }\n\n    /**\n     * @dev See {IERC165-supportsInterface}.\n     */\n    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {\n        return\n            interfaceId == type(IERC721).interfaceId ||\n            interfaceId == type(IERC721Metadata).interfaceId ||\n            super.supportsInterface(interfaceId);\n    }\n\n    /**\n     * @dev See {IERC721-balanceOf}.\n     */\n    function balanceOf(address owner) public view virtual returns (uint256) {\n        if (owner == address(0)) {\n            revert ERC721InvalidOwner(address(0));\n        }\n        return _balances[owner];\n    }\n\n    /**\n     * @dev See {IERC721-ownerOf}.\n     */\n    function ownerOf(uint256 tokenId) public view virtual returns (address) {\n        return _requireOwned(tokenId);\n    }\n\n    /**\n     * @dev See {IERC721Metadata-name}.\n     */\n    function name() public view virtual returns (string memory) {\n        return _name;\n    }\n\n    /**\n     * @dev See {IERC721Metadata-symbol}.\n     */\n    function symbol() public view virtual returns (string memory) {\n        return _symbol;\n    }\n\n    /**\n     * @dev See {IERC721Metadata-tokenURI}.\n     */\n    function tokenURI(uint256 tokenId) public view virtual returns (string memory) {\n        _requireOwned(tokenId);\n\n        string memory baseURI = _baseURI();\n        return bytes(baseURI).length > 0 ? string.concat(baseURI, tokenId.toString()) : \"\";\n    }\n\n    /**\n     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each\n     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty\n     * by default, can be overridden in child contracts.\n     */\n    function _baseURI() internal view virtual returns (string memory) {\n        return \"\";\n    }\n\n    /**\n     * @dev See {IERC721-approve}.\n     */\n    function approve(address to, uint256 tokenId) public virtual {\n        _approve(to, tokenId, _msgSender());\n    }\n\n    /**\n     * @dev See {IERC721-getApproved}.\n     */\n    function getApproved(uint256 tokenId) public view virtual returns (address) {\n        _requireOwned(tokenId);\n\n        return _getApproved(tokenId);\n    }\n\n    /**\n     * @dev See {IERC721-setApprovalForAll}.\n     */\n    function setApprovalForAll(address operator, bool approved) public virtual {\n        _setApprovalForAll(_msgSender(), operator, approved);\n    }\n\n    /**\n     * @dev See {IERC721-isApprovedForAll}.\n     */\n    function isApprovedForAll(address owner, address operator) public view virtual returns (bool) {\n        return _operatorApprovals[owner][operator];\n    }\n\n    /**\n     * @dev See {IERC721-transferFrom}.\n     */\n    function transferFrom(address from, address to, uint256 tokenId) public virtual {\n        if (to == address(0)) {\n            revert ERC721InvalidReceiver(address(0));\n        }\n        // Setting an \"auth\" arguments enables the `_isAuthorized` check which verifies that the token exists\n        // (from != 0). Therefore, it is not needed to verify that the return value is not 0 here.\n        address previousOwner = _update(to, tokenId, _msgSender());\n        if (previousOwner != from) {\n            revert ERC721IncorrectOwner(from, tokenId, previousOwner);\n        }\n    }\n\n    /**\n     * @dev See {IERC721-safeTransferFrom}.\n     */\n    function safeTransferFrom(address from, address to, uint256 tokenId) public {\n        safeTransferFrom(from, to, tokenId, \"\");\n    }\n\n    /**\n     * @dev See {IERC721-safeTransferFrom}.\n     */\n    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public virtual {\n        transferFrom(from, to, tokenId);\n        _checkOnERC721Received(from, to, tokenId, data);\n    }\n\n    /**\n     * @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist\n     *\n     * IMPORTANT: Any overrides to this function that add ownership of tokens not tracked by the\n     * core ERC721 logic MUST be matched with the use of {_increaseBalance} to keep balances\n     * consistent with ownership. The invariant to preserve is that for any address `a` the value returned by\n     * `balanceOf(a)` must be equal to the number of tokens such that `_ownerOf(tokenId)` is `a`.\n     */\n    function _ownerOf(uint256 tokenId) internal view virtual returns (address) {\n        return _owners[tokenId];\n    }\n\n    /**\n     * @dev Returns the approved address for `tokenId`. Returns 0 if `tokenId` is not minted.\n     */\n    function _getApproved(uint256 tokenId) internal view virtual returns (address) {\n        return _tokenApprovals[tokenId];\n    }\n\n    /**\n     * @dev Returns whether `spender` is allowed to manage `owner`'s tokens, or `tokenId` in\n     * particular (ignoring whether it is owned by `owner`).\n     *\n     * WARNING: This function assumes that `owner` is the actual owner of `tokenId` and does not verify this\n     * assumption.\n     */\n    function _isAuthorized(address owner, address spender, uint256 tokenId) internal view virtual returns (bool) {\n        return\n            spender != address(0) &&\n            (owner == spender || isApprovedForAll(owner, spender) || _getApproved(tokenId) == spender);\n    }\n\n    /**\n     * @dev Checks if `spender` can operate on `tokenId`, assuming the provided `owner` is the actual owner.\n     * Reverts if `spender` does not have approval from the provided `owner` for the given token or for all its assets\n     * the `spender` for the specific `tokenId`.\n     *\n     * WARNING: This function assumes that `owner` is the actual owner of `tokenId` and does not verify this\n     * assumption.\n     */\n    function _checkAuthorized(address owner, address spender, uint256 tokenId) internal view virtual {\n        if (!_isAuthorized(owner, spender, tokenId)) {\n            if (owner == address(0)) {\n                revert ERC721NonexistentToken(tokenId);\n            } else {\n                revert ERC721InsufficientApproval(spender, tokenId);\n            }\n        }\n    }\n\n    /**\n     * @dev Unsafe write access to the balances, used by extensions that \"mint\" tokens using an {ownerOf} override.\n     *\n     * NOTE: the value is limited to type(uint128).max. This protect against _balance overflow. It is unrealistic that\n     * a uint256 would ever overflow from increments when these increments are bounded to uint128 values.\n     *\n     * WARNING: Increasing an account's balance using this function tends to be paired with an override of the\n     * {_ownerOf} function to resolve the ownership of the corresponding tokens so that balances and ownership\n     * remain consistent with one another.\n     */\n    function _increaseBalance(address account, uint128 value) internal virtual {\n        unchecked {\n            _balances[account] += value;\n        }\n    }\n\n    /**\n     * @dev Transfers `tokenId` from its current owner to `to`, or alternatively mints (or burns) if the current owner\n     * (or `to`) is the zero address. Returns the owner of the `tokenId` before the update.\n     *\n     * The `auth` argument is optional. If the value passed is non 0, then this function will check that\n     * `auth` is either the owner of the token, or approved to operate on the token (by the owner).\n     *\n     * Emits a {Transfer} event.\n     *\n     * NOTE: If overriding this function in a way that tracks balances, see also {_increaseBalance}.\n     */\n    function _update(address to, uint256 tokenId, address auth) internal virtual returns (address) {\n        address from = _ownerOf(tokenId);\n\n        // Perform (optional) operator check\n        if (auth != address(0)) {\n            _checkAuthorized(from, auth, tokenId);\n        }\n\n        // Execute the update\n        if (from != address(0)) {\n            // Clear approval. No need to re-authorize or emit the Approval event\n            _approve(address(0), tokenId, address(0), false);\n\n            unchecked {\n                _balances[from] -= 1;\n            }\n        }\n\n        if (to != address(0)) {\n            unchecked {\n                _balances[to] += 1;\n            }\n        }\n\n        _owners[tokenId] = to;\n\n        emit Transfer(from, to, tokenId);\n\n        return from;\n    }\n\n    /**\n     * @dev Mints `tokenId` and transfers it to `to`.\n     *\n     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible\n     *\n     * Requirements:\n     *\n     * - `tokenId` must not exist.\n     * - `to` cannot be the zero address.\n     *\n     * Emits a {Transfer} event.\n     */\n    function _mint(address to, uint256 tokenId) internal {\n        if (to == address(0)) {\n            revert ERC721InvalidReceiver(address(0));\n        }\n        address previousOwner = _update(to, tokenId, address(0));\n        if (previousOwner != address(0)) {\n            revert ERC721InvalidSender(address(0));\n        }\n    }\n\n    /**\n     * @dev Mints `tokenId`, transfers it to `to` and checks for `to` acceptance.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must not exist.\n     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\n     *\n     * Emits a {Transfer} event.\n     */\n    function _safeMint(address to, uint256 tokenId) internal {\n        _safeMint(to, tokenId, \"\");\n    }\n\n    /**\n     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is\n     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.\n     */\n    function _safeMint(address to, uint256 tokenId, bytes memory data) internal virtual {\n        _mint(to, tokenId);\n        _checkOnERC721Received(address(0), to, tokenId, data);\n    }\n\n    /**\n     * @dev Destroys `tokenId`.\n     * The approval is cleared when the token is burned.\n     * This is an internal function that does not check if the sender is authorized to operate on the token.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must exist.\n     *\n     * Emits a {Transfer} event.\n     */\n    function _burn(uint256 tokenId) internal {\n        address previousOwner = _update(address(0), tokenId, address(0));\n        if (previousOwner == address(0)) {\n            revert ERC721NonexistentToken(tokenId);\n        }\n    }\n\n    /**\n     * @dev Transfers `tokenId` from `from` to `to`.\n     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.\n     *\n     * Requirements:\n     *\n     * - `to` cannot be the zero address.\n     * - `tokenId` token must be owned by `from`.\n     *\n     * Emits a {Transfer} event.\n     */\n    function _transfer(address from, address to, uint256 tokenId) internal {\n        if (to == address(0)) {\n            revert ERC721InvalidReceiver(address(0));\n        }\n        address previousOwner = _update(to, tokenId, address(0));\n        if (previousOwner == address(0)) {\n            revert ERC721NonexistentToken(tokenId);\n        } else if (previousOwner != from) {\n            revert ERC721IncorrectOwner(from, tokenId, previousOwner);\n        }\n    }\n\n    /**\n     * @dev Safely transfers `tokenId` token from `from` to `to`, checking that contract recipients\n     * are aware of the ERC721 standard to prevent tokens from being forever locked.\n     *\n     * `data` is additional data, it has no specified format and it is sent in call to `to`.\n     *\n     * This internal function is like {safeTransferFrom} in the sense that it invokes\n     * {IERC721Receiver-onERC721Received} on the receiver, and can be used to e.g.\n     * implement alternative mechanisms to perform token transfer, such as signature-based.\n     *\n     * Requirements:\n     *\n     * - `tokenId` token must exist and be owned by `from`.\n     * - `to` cannot be the zero address.\n     * - `from` cannot be the zero address.\n     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\n     *\n     * Emits a {Transfer} event.\n     */\n    function _safeTransfer(address from, address to, uint256 tokenId) internal {\n        _safeTransfer(from, to, tokenId, \"\");\n    }\n\n    /**\n     * @dev Same as {xref-ERC721-_safeTransfer-address-address-uint256-}[`_safeTransfer`], with an additional `data` parameter which is\n     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.\n     */\n    function _safeTransfer(address from, address to, uint256 tokenId, bytes memory data) internal virtual {\n        _transfer(from, to, tokenId);\n        _checkOnERC721Received(from, to, tokenId, data);\n    }\n\n    /**\n     * @dev Approve `to` to operate on `tokenId`\n     *\n     * The `auth` argument is optional. If the value passed is non 0, then this function will check that `auth` is\n     * either the owner of the token, or approved to operate on all tokens held by this owner.\n     *\n     * Emits an {Approval} event.\n     *\n     * Overrides to this logic should be done to the variant with an additional `bool emitEvent` argument.\n     */\n    function _approve(address to, uint256 tokenId, address auth) internal {\n        _approve(to, tokenId, auth, true);\n    }\n\n    /**\n     * @dev Variant of `_approve` with an optional flag to enable or disable the {Approval} event. The event is not\n     * emitted in the context of transfers.\n     */\n    function _approve(address to, uint256 tokenId, address auth, bool emitEvent) internal virtual {\n        // Avoid reading the owner unless necessary\n        if (emitEvent || auth != address(0)) {\n            address owner = _requireOwned(tokenId);\n\n            // We do not use _isAuthorized because single-token approvals should not be able to call approve\n            if (auth != address(0) && owner != auth && !isApprovedForAll(owner, auth)) {\n                revert ERC721InvalidApprover(auth);\n            }\n\n            if (emitEvent) {\n                emit Approval(owner, to, tokenId);\n            }\n        }\n\n        _tokenApprovals[tokenId] = to;\n    }\n\n    /**\n     * @dev Approve `operator` to operate on all of `owner` tokens\n     *\n     * Requirements:\n     * - operator can't be the address zero.\n     *\n     * Emits an {ApprovalForAll} event.\n     */\n    function _setApprovalForAll(address owner, address operator, bool approved) internal virtual {\n        if (operator == address(0)) {\n            revert ERC721InvalidOperator(operator);\n        }\n        _operatorApprovals[owner][operator] = approved;\n        emit ApprovalForAll(owner, operator, approved);\n    }\n\n    /**\n     * @dev Reverts if the `tokenId` doesn't have a current owner (it hasn't been minted, or it has been burned).\n     * Returns the owner.\n     *\n     * Overrides to ownership logic should be done to {_ownerOf}.\n     */\n    function _requireOwned(uint256 tokenId) internal view returns (address) {\n        address owner = _ownerOf(tokenId);\n        if (owner == address(0)) {\n            revert ERC721NonexistentToken(tokenId);\n        }\n        return owner;\n    }\n\n    /**\n     * @dev Private function to invoke {IERC721Receiver-onERC721Received} on a target address. This will revert if the\n     * recipient doesn't accept the token transfer. The call is not executed if the target address is not a contract.\n     *\n     * @param from address representing the previous owner of the given token ID\n     * @param to target address that will receive the tokens\n     * @param tokenId uint256 ID of the token to be transferred\n     * @param data bytes optional data to send along with the call\n     */\n    function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory data) private {\n        if (to.code.length > 0) {\n            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) {\n                if (retval != IERC721Receiver.onERC721Received.selector) {\n                    revert ERC721InvalidReceiver(to);\n                }\n            } catch (bytes memory reason) {\n                if (reason.length == 0) {\n                    revert ERC721InvalidReceiver(to);\n                } else {\n                    /// @solidity memory-safe-assembly\n                    assembly {\n                        revert(add(32, reason), mload(reason))\n                    }\n                }\n            }\n        }\n    }\n}\n"
      },
      "@openzeppelin/contracts/utils/cryptography/ECDSA.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.9.0) (utils/cryptography/ECDSA.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../Strings.sol\";\n\n/**\n * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.\n *\n * These functions can be used to verify that a message was signed by the holder\n * of the private keys of a given address.\n */\nlibrary ECDSA {\n    enum RecoverError {\n        NoError,\n        InvalidSignature,\n        InvalidSignatureLength,\n        InvalidSignatureS,\n        InvalidSignatureV // Deprecated in v4.8\n    }\n\n    function _throwError(RecoverError error) private pure {\n        if (error == RecoverError.NoError) {\n            return; // no error: do nothing\n        } else if (error == RecoverError.InvalidSignature) {\n            revert(\"ECDSA: invalid signature\");\n        } else if (error == RecoverError.InvalidSignatureLength) {\n            revert(\"ECDSA: invalid signature length\");\n        } else if (error == RecoverError.InvalidSignatureS) {\n            revert(\"ECDSA: invalid signature 's' value\");\n        }\n    }\n\n    /**\n     * @dev Returns the address that signed a hashed message (`hash`) with\n     * `signature` or error string. This address can then be used for verification purposes.\n     *\n     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:\n     * this function rejects them by requiring the `s` value to be in the lower\n     * half order, and the `v` value to be either 27 or 28.\n     *\n     * IMPORTANT: `hash` _must_ be the result of a hash operation for the\n     * verification to be secure: it is possible to craft signatures that\n     * recover to arbitrary addresses for non-hashed data. A safe way to ensure\n     * this is by receiving a hash of the original message (which may otherwise\n     * be too long), and then calling {toEthSignedMessageHash} on it.\n     *\n     * Documentation for signature generation:\n     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]\n     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]\n     *\n     * _Available since v4.3._\n     */\n    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {\n        if (signature.length == 65) {\n            bytes32 r;\n            bytes32 s;\n            uint8 v;\n            // ecrecover takes the signature parameters, and the only way to get them\n            // currently is to use assembly.\n            /// @solidity memory-safe-assembly\n            assembly {\n                r := mload(add(signature, 0x20))\n                s := mload(add(signature, 0x40))\n                v := byte(0, mload(add(signature, 0x60)))\n            }\n            return tryRecover(hash, v, r, s);\n        } else {\n            return (address(0), RecoverError.InvalidSignatureLength);\n        }\n    }\n\n    /**\n     * @dev Returns the address that signed a hashed message (`hash`) with\n     * `signature`. This address can then be used for verification purposes.\n     *\n     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:\n     * this function rejects them by requiring the `s` value to be in the lower\n     * half order, and the `v` value to be either 27 or 28.\n     *\n     * IMPORTANT: `hash` _must_ be the result of a hash operation for the\n     * verification to be secure: it is possible to craft signatures that\n     * recover to arbitrary addresses for non-hashed data. A safe way to ensure\n     * this is by receiving a hash of the original message (which may otherwise\n     * be too long), and then calling {toEthSignedMessageHash} on it.\n     */\n    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {\n        (address recovered, RecoverError error) = tryRecover(hash, signature);\n        _throwError(error);\n        return recovered;\n    }\n\n    /**\n     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.\n     *\n     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]\n     *\n     * _Available since v4.3._\n     */\n    function tryRecover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address, RecoverError) {\n        bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);\n        uint8 v = uint8((uint256(vs) >> 255) + 27);\n        return tryRecover(hash, v, r, s);\n    }\n\n    /**\n     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.\n     *\n     * _Available since v4.2._\n     */\n    function recover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address) {\n        (address recovered, RecoverError error) = tryRecover(hash, r, vs);\n        _throwError(error);\n        return recovered;\n    }\n\n    /**\n     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,\n     * `r` and `s` signature fields separately.\n     *\n     * _Available since v4.3._\n     */\n    function tryRecover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address, RecoverError) {\n        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature\n        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines\n        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most\n        // signatures from current libraries generate a unique signature with an s-value in the lower half order.\n        //\n        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value\n        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or\n        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept\n        // these malleable signatures as well.\n        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {\n            return (address(0), RecoverError.InvalidSignatureS);\n        }\n\n        // If the signature is valid (and not malleable), return the signer address\n        address signer = ecrecover(hash, v, r, s);\n        if (signer == address(0)) {\n            return (address(0), RecoverError.InvalidSignature);\n        }\n\n        return (signer, RecoverError.NoError);\n    }\n\n    /**\n     * @dev Overload of {ECDSA-recover} that receives the `v`,\n     * `r` and `s` signature fields separately.\n     */\n    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {\n        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);\n        _throwError(error);\n        return recovered;\n    }\n\n    /**\n     * @dev Returns an Ethereum Signed Message, created from a `hash`. This\n     * produces hash corresponding to the one signed with the\n     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]\n     * JSON-RPC method as part of EIP-191.\n     *\n     * See {recover}.\n     */\n    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32 message) {\n        // 32 is the length in bytes of hash,\n        // enforced by the type signature above\n        /// @solidity memory-safe-assembly\n        assembly {\n            mstore(0x00, \"\\x19Ethereum Signed Message:\\n32\")\n            mstore(0x1c, hash)\n            message := keccak256(0x00, 0x3c)\n        }\n    }\n\n    /**\n     * @dev Returns an Ethereum Signed Message, created from `s`. This\n     * produces hash corresponding to the one signed with the\n     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]\n     * JSON-RPC method as part of EIP-191.\n     *\n     * See {recover}.\n     */\n    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {\n        return keccak256(abi.encodePacked(\"\\x19Ethereum Signed Message:\\n\", Strings.toString(s.length), s));\n    }\n\n    /**\n     * @dev Returns an Ethereum Signed Typed Data, created from a\n     * `domainSeparator` and a `structHash`. This produces hash corresponding\n     * to the one signed with the\n     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]\n     * JSON-RPC method as part of EIP-712.\n     *\n     * See {recover}.\n     */\n    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32 data) {\n        /// @solidity memory-safe-assembly\n        assembly {\n            let ptr := mload(0x40)\n            mstore(ptr, \"\\x19\\x01\")\n            mstore(add(ptr, 0x02), domainSeparator)\n            mstore(add(ptr, 0x22), structHash)\n            data := keccak256(ptr, 0x42)\n        }\n    }\n\n    /**\n     * @dev Returns an Ethereum Signed Data with intended validator, created from a\n     * `validator` and `data` according to the version 0 of EIP-191.\n     *\n     * See {recover}.\n     */\n    function toDataWithIntendedValidatorHash(address validator, bytes memory data) internal pure returns (bytes32) {\n        return keccak256(abi.encodePacked(\"\\x19\\x00\", validator, data));\n    }\n}\n"
      },
      "@openzeppelin/contracts/access/Ownable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../utils/Context.sol\";\n\n/**\n * @dev Contract module which provides a basic access control mechanism, where\n * there is an account (an owner) that can be granted exclusive access to\n * specific functions.\n *\n * By default, the owner account will be the one that deploys the contract. This\n * can later be changed with {transferOwnership}.\n *\n * This module is used through inheritance. It will make available the modifier\n * `onlyOwner`, which can be applied to your functions to restrict their use to\n * the owner.\n */\nabstract contract Ownable is Context {\n    address private _owner;\n\n    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\n\n    /**\n     * @dev Initializes the contract setting the deployer as the initial owner.\n     */\n    constructor() {\n        _transferOwnership(_msgSender());\n    }\n\n    /**\n     * @dev Throws if called by any account other than the owner.\n     */\n    modifier onlyOwner() {\n        _checkOwner();\n        _;\n    }\n\n    /**\n     * @dev Returns the address of the current owner.\n     */\n    function owner() public view virtual returns (address) {\n        return _owner;\n    }\n\n    /**\n     * @dev Throws if the sender is not the owner.\n     */\n    function _checkOwner() internal view virtual {\n        require(owner() == _msgSender(), \"Ownable: caller is not the owner\");\n    }\n\n    /**\n     * @dev Leaves the contract without owner. It will not be possible to call\n     * `onlyOwner` functions. Can only be called by the current owner.\n     *\n     * NOTE: Renouncing ownership will leave the contract without an owner,\n     * thereby disabling any functionality that is only available to the owner.\n     */\n    function renounceOwnership() public virtual onlyOwner {\n        _transferOwnership(address(0));\n    }\n\n    /**\n     * @dev Transfers ownership of the contract to a new account (`newOwner`).\n     * Can only be called by the current owner.\n     */\n    function transferOwnership(address newOwner) public virtual onlyOwner {\n        require(newOwner != address(0), \"Ownable: new owner is the zero address\");\n        _transferOwnership(newOwner);\n    }\n\n    /**\n     * @dev Transfers ownership of the contract to a new account (`newOwner`).\n     * Internal function without access restriction.\n     */\n    function _transferOwnership(address newOwner) internal virtual {\n        address oldOwner = _owner;\n        _owner = newOwner;\n        emit OwnershipTransferred(oldOwner, newOwner);\n    }\n}\n"
      },
      "@openzeppelin/contracts/utils/Strings.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)\n\npragma solidity ^0.8.0;\n\nimport \"./math/Math.sol\";\nimport \"./math/SignedMath.sol\";\n\n/**\n * @dev String operations.\n */\nlibrary Strings {\n    bytes16 private constant _SYMBOLS = \"0123456789abcdef\";\n    uint8 private constant _ADDRESS_LENGTH = 20;\n\n    /**\n     * @dev Converts a `uint256` to its ASCII `string` decimal representation.\n     */\n    function toString(uint256 value) internal pure returns (string memory) {\n        unchecked {\n            uint256 length = Math.log10(value) + 1;\n            string memory buffer = new string(length);\n            uint256 ptr;\n            /// @solidity memory-safe-assembly\n            assembly {\n                ptr := add(buffer, add(32, length))\n            }\n            while (true) {\n                ptr--;\n                /// @solidity memory-safe-assembly\n                assembly {\n                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))\n                }\n                value /= 10;\n                if (value == 0) break;\n            }\n            return buffer;\n        }\n    }\n\n    /**\n     * @dev Converts a `int256` to its ASCII `string` decimal representation.\n     */\n    function toString(int256 value) internal pure returns (string memory) {\n        return string(abi.encodePacked(value < 0 ? \"-\" : \"\", toString(SignedMath.abs(value))));\n    }\n\n    /**\n     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.\n     */\n    function toHexString(uint256 value) internal pure returns (string memory) {\n        unchecked {\n            return toHexString(value, Math.log256(value) + 1);\n        }\n    }\n\n    /**\n     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.\n     */\n    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {\n        bytes memory buffer = new bytes(2 * length + 2);\n        buffer[0] = \"0\";\n        buffer[1] = \"x\";\n        for (uint256 i = 2 * length + 1; i > 1; --i) {\n            buffer[i] = _SYMBOLS[value & 0xf];\n            value >>= 4;\n        }\n        require(value == 0, \"Strings: hex length insufficient\");\n        return string(buffer);\n    }\n\n    /**\n     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.\n     */\n    function toHexString(address addr) internal pure returns (string memory) {\n        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);\n    }\n\n    /**\n     * @dev Returns true if the two strings are equal.\n     */\n    function equal(string memory a, string memory b) internal pure returns (bool) {\n        return keccak256(bytes(a)) == keccak256(bytes(b));\n    }\n}\n"
      },
      "@openzeppelin/contracts/utils/introspection/ERC165.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)\n\npragma solidity ^0.8.0;\n\nimport \"./IERC165.sol\";\n\n/**\n * @dev Implementation of the {IERC165} interface.\n *\n * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check\n * for the additional interface id that will be supported. For example:\n *\n * ```solidity\n * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {\n *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);\n * }\n * ```\n *\n * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.\n */\nabstract contract ERC165 is IERC165 {\n    /**\n     * @dev See {IERC165-supportsInterface}.\n     */\n    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {\n        return interfaceId == type(IERC165).interfaceId;\n    }\n}\n"
      },
      "@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/extensions/IERC721Enumerable.sol)\n\npragma solidity ^0.8.20;\n\nimport {IERC721} from \"../IERC721.sol\";\n\n/**\n * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension\n * @dev See https://eips.ethereum.org/EIPS/eip-721\n */\ninterface IERC721Enumerable is IERC721 {\n    /**\n     * @dev Returns the total amount of tokens stored by the contract.\n     */\n    function totalSupply() external view returns (uint256);\n\n    /**\n     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.\n     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.\n     */\n    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256);\n\n    /**\n     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.\n     * Use along with {totalSupply} to enumerate all tokens.\n     */\n    function tokenByIndex(uint256 index) external view returns (uint256);\n}\n"
      },
      "@openzeppelin/contracts/interfaces/draft-IERC6093.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/draft-IERC6093.sol)\npragma solidity ^0.8.20;\n\n/**\n * @dev Standard ERC20 Errors\n * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC20 tokens.\n */\ninterface IERC20Errors {\n    /**\n     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.\n     * @param sender Address whose tokens are being transferred.\n     * @param balance Current balance for the interacting account.\n     * @param needed Minimum amount required to perform a transfer.\n     */\n    error ERC20InsufficientBalance(address sender, uint256 balance, uint256 needed);\n\n    /**\n     * @dev Indicates a failure with the token `sender`. Used in transfers.\n     * @param sender Address whose tokens are being transferred.\n     */\n    error ERC20InvalidSender(address sender);\n\n    /**\n     * @dev Indicates a failure with the token `receiver`. Used in transfers.\n     * @param receiver Address to which tokens are being transferred.\n     */\n    error ERC20InvalidReceiver(address receiver);\n\n    /**\n     * @dev Indicates a failure with the `spender`’s `allowance`. Used in transfers.\n     * @param spender Address that may be allowed to operate on tokens without being their owner.\n     * @param allowance Amount of tokens a `spender` is allowed to operate with.\n     * @param needed Minimum amount required to perform a transfer.\n     */\n    error ERC20InsufficientAllowance(address spender, uint256 allowance, uint256 needed);\n\n    /**\n     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.\n     * @param approver Address initiating an approval operation.\n     */\n    error ERC20InvalidApprover(address approver);\n\n    /**\n     * @dev Indicates a failure with the `spender` to be approved. Used in approvals.\n     * @param spender Address that may be allowed to operate on tokens without being their owner.\n     */\n    error ERC20InvalidSpender(address spender);\n}\n\n/**\n * @dev Standard ERC721 Errors\n * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC721 tokens.\n */\ninterface IERC721Errors {\n    /**\n     * @dev Indicates that an address can't be an owner. For example, `address(0)` is a forbidden owner in EIP-20.\n     * Used in balance queries.\n     * @param owner Address of the current owner of a token.\n     */\n    error ERC721InvalidOwner(address owner);\n\n    /**\n     * @dev Indicates a `tokenId` whose `owner` is the zero address.\n     * @param tokenId Identifier number of a token.\n     */\n    error ERC721NonexistentToken(uint256 tokenId);\n\n    /**\n     * @dev Indicates an error related to the ownership over a particular token. Used in transfers.\n     * @param sender Address whose tokens are being transferred.\n     * @param tokenId Identifier number of a token.\n     * @param owner Address of the current owner of a token.\n     */\n    error ERC721IncorrectOwner(address sender, uint256 tokenId, address owner);\n\n    /**\n     * @dev Indicates a failure with the token `sender`. Used in transfers.\n     * @param sender Address whose tokens are being transferred.\n     */\n    error ERC721InvalidSender(address sender);\n\n    /**\n     * @dev Indicates a failure with the token `receiver`. Used in transfers.\n     * @param receiver Address to which tokens are being transferred.\n     */\n    error ERC721InvalidReceiver(address receiver);\n\n    /**\n     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.\n     * @param operator Address that may be allowed to operate on tokens without being their owner.\n     * @param tokenId Identifier number of a token.\n     */\n    error ERC721InsufficientApproval(address operator, uint256 tokenId);\n\n    /**\n     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.\n     * @param approver Address initiating an approval operation.\n     */\n    error ERC721InvalidApprover(address approver);\n\n    /**\n     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.\n     * @param operator Address that may be allowed to operate on tokens without being their owner.\n     */\n    error ERC721InvalidOperator(address operator);\n}\n\n/**\n * @dev Standard ERC1155 Errors\n * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC1155 tokens.\n */\ninterface IERC1155Errors {\n    /**\n     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.\n     * @param sender Address whose tokens are being transferred.\n     * @param balance Current balance for the interacting account.\n     * @param needed Minimum amount required to perform a transfer.\n     * @param tokenId Identifier number of a token.\n     */\n    error ERC1155InsufficientBalance(address sender, uint256 balance, uint256 needed, uint256 tokenId);\n\n    /**\n     * @dev Indicates a failure with the token `sender`. Used in transfers.\n     * @param sender Address whose tokens are being transferred.\n     */\n    error ERC1155InvalidSender(address sender);\n\n    /**\n     * @dev Indicates a failure with the token `receiver`. Used in transfers.\n     * @param receiver Address to which tokens are being transferred.\n     */\n    error ERC1155InvalidReceiver(address receiver);\n\n    /**\n     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.\n     * @param operator Address that may be allowed to operate on tokens without being their owner.\n     * @param owner Address of the current owner of a token.\n     */\n    error ERC1155MissingApprovalForAll(address operator, address owner);\n\n    /**\n     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.\n     * @param approver Address initiating an approval operation.\n     */\n    error ERC1155InvalidApprover(address approver);\n\n    /**\n     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.\n     * @param operator Address that may be allowed to operate on tokens without being their owner.\n     */\n    error ERC1155InvalidOperator(address operator);\n\n    /**\n     * @dev Indicates an array length mismatch between ids and values in a safeBatchTransferFrom operation.\n     * Used in batch transfers.\n     * @param idsLength Length of the array of token identifiers\n     * @param valuesLength Length of the array of token amounts\n     */\n    error ERC1155InvalidArrayLength(uint256 idsLength, uint256 valuesLength);\n}\n"
      },
      "@openzeppelin/contracts/utils/Context.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Provides information about the current execution context, including the\n * sender of the transaction and its data. While these are generally available\n * via msg.sender and msg.data, they should not be accessed in such a direct\n * manner, since when dealing with meta-transactions the account sending and\n * paying for execution may not be the actual sender (as far as an application\n * is concerned).\n *\n * This contract is only required for intermediate, library-like contracts.\n */\nabstract contract Context {\n    function _msgSender() internal view virtual returns (address) {\n        return msg.sender;\n    }\n\n    function _msgData() internal view virtual returns (bytes calldata) {\n        return msg.data;\n    }\n}\n"
      },
      "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/extensions/IERC721Metadata.sol)\n\npragma solidity ^0.8.20;\n\nimport {IERC721} from \"../IERC721.sol\";\n\n/**\n * @title ERC-721 Non-Fungible Token Standard, optional metadata extension\n * @dev See https://eips.ethereum.org/EIPS/eip-721\n */\ninterface IERC721Metadata is IERC721 {\n    /**\n     * @dev Returns the token collection name.\n     */\n    function name() external view returns (string memory);\n\n    /**\n     * @dev Returns the token collection symbol.\n     */\n    function symbol() external view returns (string memory);\n\n    /**\n     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.\n     */\n    function tokenURI(uint256 tokenId) external view returns (string memory);\n}\n"
      },
      "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/IERC721Receiver.sol)\n\npragma solidity ^0.8.20;\n\n/**\n * @title ERC721 token receiver interface\n * @dev Interface for any contract that wants to support safeTransfers\n * from ERC721 asset contracts.\n */\ninterface IERC721Receiver {\n    /**\n     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}\n     * by `operator` from `from`, this function is called.\n     *\n     * It must return its Solidity selector to confirm the token transfer.\n     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be\n     * reverted.\n     *\n     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.\n     */\n    function onERC721Received(\n        address operator,\n        address from,\n        uint256 tokenId,\n        bytes calldata data\n    ) external returns (bytes4);\n}\n"
      },
      "@openzeppelin/contracts/token/ERC721/IERC721.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/IERC721.sol)\n\npragma solidity ^0.8.20;\n\nimport {IERC165} from \"../../utils/introspection/IERC165.sol\";\n\n/**\n * @dev Required interface of an ERC721 compliant contract.\n */\ninterface IERC721 is IERC165 {\n    /**\n     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.\n     */\n    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);\n\n    /**\n     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.\n     */\n    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);\n\n    /**\n     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.\n     */\n    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);\n\n    /**\n     * @dev Returns the number of tokens in ``owner``'s account.\n     */\n    function balanceOf(address owner) external view returns (uint256 balance);\n\n    /**\n     * @dev Returns the owner of the `tokenId` token.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must exist.\n     */\n    function ownerOf(uint256 tokenId) external view returns (address owner);\n\n    /**\n     * @dev Safely transfers `tokenId` token from `from` to `to`.\n     *\n     * Requirements:\n     *\n     * - `from` cannot be the zero address.\n     * - `to` cannot be the zero address.\n     * - `tokenId` token must exist and be owned by `from`.\n     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.\n     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon\n     *   a safe transfer.\n     *\n     * Emits a {Transfer} event.\n     */\n    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;\n\n    /**\n     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients\n     * are aware of the ERC721 protocol to prevent tokens from being forever locked.\n     *\n     * Requirements:\n     *\n     * - `from` cannot be the zero address.\n     * - `to` cannot be the zero address.\n     * - `tokenId` token must exist and be owned by `from`.\n     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or\n     *   {setApprovalForAll}.\n     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon\n     *   a safe transfer.\n     *\n     * Emits a {Transfer} event.\n     */\n    function safeTransferFrom(address from, address to, uint256 tokenId) external;\n\n    /**\n     * @dev Transfers `tokenId` token from `from` to `to`.\n     *\n     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721\n     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must\n     * understand this adds an external call which potentially creates a reentrancy vulnerability.\n     *\n     * Requirements:\n     *\n     * - `from` cannot be the zero address.\n     * - `to` cannot be the zero address.\n     * - `tokenId` token must be owned by `from`.\n     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transferFrom(address from, address to, uint256 tokenId) external;\n\n    /**\n     * @dev Gives permission to `to` to transfer `tokenId` token to another account.\n     * The approval is cleared when the token is transferred.\n     *\n     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.\n     *\n     * Requirements:\n     *\n     * - The caller must own the token or be an approved operator.\n     * - `tokenId` must exist.\n     *\n     * Emits an {Approval} event.\n     */\n    function approve(address to, uint256 tokenId) external;\n\n    /**\n     * @dev Approve or remove `operator` as an operator for the caller.\n     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.\n     *\n     * Requirements:\n     *\n     * - The `operator` cannot be the address zero.\n     *\n     * Emits an {ApprovalForAll} event.\n     */\n    function setApprovalForAll(address operator, bool approved) external;\n\n    /**\n     * @dev Returns the account approved for `tokenId` token.\n     *\n     * Requirements:\n     *\n     * - `tokenId` must exist.\n     */\n    function getApproved(uint256 tokenId) external view returns (address operator);\n\n    /**\n     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.\n     *\n     * See {setApprovalForAll}\n     */\n    function isApprovedForAll(address owner, address operator) external view returns (bool);\n}\n"
      },
      "@openzeppelin/contracts/utils/introspection/IERC165.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Interface of the ERC165 standard, as defined in the\n * https://eips.ethereum.org/EIPS/eip-165[EIP].\n *\n * Implementers can declare support of contract interfaces, which can then be\n * queried by others ({ERC165Checker}).\n *\n * For an implementation, see {ERC165}.\n */\ninterface IERC165 {\n    /**\n     * @dev Returns true if this contract implements the interface defined by\n     * `interfaceId`. See the corresponding\n     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]\n     * to learn more about how these ids are created.\n     *\n     * This function call must use less than 30 000 gas.\n     */\n    function supportsInterface(bytes4 interfaceId) external view returns (bool);\n}\n"
      },
      "@openzeppelin/contracts/utils/math/SignedMath.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Standard signed math utilities missing in the Solidity language.\n */\nlibrary SignedMath {\n    /**\n     * @dev Returns the largest of two signed numbers.\n     */\n    function max(int256 a, int256 b) internal pure returns (int256) {\n        return a > b ? a : b;\n    }\n\n    /**\n     * @dev Returns the smallest of two signed numbers.\n     */\n    function min(int256 a, int256 b) internal pure returns (int256) {\n        return a < b ? a : b;\n    }\n\n    /**\n     * @dev Returns the average of two signed numbers without overflow.\n     * The result is rounded towards zero.\n     */\n    function average(int256 a, int256 b) internal pure returns (int256) {\n        // Formula from the book \"Hacker's Delight\"\n        int256 x = (a & b) + ((a ^ b) >> 1);\n        return x + (int256(uint256(x) >> 255) & (a ^ b));\n    }\n\n    /**\n     * @dev Returns the absolute unsigned value of a signed value.\n     */\n    function abs(int256 n) internal pure returns (uint256) {\n        unchecked {\n            // must be unchecked in order to support `n = type(int256).min`\n            return uint256(n >= 0 ? n : -n);\n        }\n    }\n}\n"
      },
      "@openzeppelin/contracts/utils/math/Math.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Standard math utilities missing in the Solidity language.\n */\nlibrary Math {\n    enum Rounding {\n        Down, // Toward negative infinity\n        Up, // Toward infinity\n        Zero // Toward zero\n    }\n\n    /**\n     * @dev Returns the largest of two numbers.\n     */\n    function max(uint256 a, uint256 b) internal pure returns (uint256) {\n        return a > b ? a : b;\n    }\n\n    /**\n     * @dev Returns the smallest of two numbers.\n     */\n    function min(uint256 a, uint256 b) internal pure returns (uint256) {\n        return a < b ? a : b;\n    }\n\n    /**\n     * @dev Returns the average of two numbers. The result is rounded towards\n     * zero.\n     */\n    function average(uint256 a, uint256 b) internal pure returns (uint256) {\n        // (a + b) / 2 can overflow.\n        return (a & b) + (a ^ b) / 2;\n    }\n\n    /**\n     * @dev Returns the ceiling of the division of two numbers.\n     *\n     * This differs from standard division with `/` in that it rounds up instead\n     * of rounding down.\n     */\n    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {\n        // (a + b - 1) / b can overflow on addition, so we distribute.\n        return a == 0 ? 0 : (a - 1) / b + 1;\n    }\n\n    /**\n     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0\n     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)\n     * with further edits by Uniswap Labs also under MIT license.\n     */\n    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {\n        unchecked {\n            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use\n            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256\n            // variables such that product = prod1 * 2^256 + prod0.\n            uint256 prod0; // Least significant 256 bits of the product\n            uint256 prod1; // Most significant 256 bits of the product\n            assembly {\n                let mm := mulmod(x, y, not(0))\n                prod0 := mul(x, y)\n                prod1 := sub(sub(mm, prod0), lt(mm, prod0))\n            }\n\n            // Handle non-overflow cases, 256 by 256 division.\n            if (prod1 == 0) {\n                // Solidity will revert if denominator == 0, unlike the div opcode on its own.\n                // The surrounding unchecked block does not change this fact.\n                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.\n                return prod0 / denominator;\n            }\n\n            // Make sure the result is less than 2^256. Also prevents denominator == 0.\n            require(denominator > prod1, \"Math: mulDiv overflow\");\n\n            ///////////////////////////////////////////////\n            // 512 by 256 division.\n            ///////////////////////////////////////////////\n\n            // Make division exact by subtracting the remainder from [prod1 prod0].\n            uint256 remainder;\n            assembly {\n                // Compute remainder using mulmod.\n                remainder := mulmod(x, y, denominator)\n\n                // Subtract 256 bit number from 512 bit number.\n                prod1 := sub(prod1, gt(remainder, prod0))\n                prod0 := sub(prod0, remainder)\n            }\n\n            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.\n            // See https://cs.stackexchange.com/q/138556/92363.\n\n            // Does not overflow because the denominator cannot be zero at this stage in the function.\n            uint256 twos = denominator & (~denominator + 1);\n            assembly {\n                // Divide denominator by twos.\n                denominator := div(denominator, twos)\n\n                // Divide [prod1 prod0] by twos.\n                prod0 := div(prod0, twos)\n\n                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.\n                twos := add(div(sub(0, twos), twos), 1)\n            }\n\n            // Shift in bits from prod1 into prod0.\n            prod0 |= prod1 * twos;\n\n            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such\n            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for\n            // four bits. That is, denominator * inv = 1 mod 2^4.\n            uint256 inverse = (3 * denominator) ^ 2;\n\n            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works\n            // in modular arithmetic, doubling the correct bits in each step.\n            inverse *= 2 - denominator * inverse; // inverse mod 2^8\n            inverse *= 2 - denominator * inverse; // inverse mod 2^16\n            inverse *= 2 - denominator * inverse; // inverse mod 2^32\n            inverse *= 2 - denominator * inverse; // inverse mod 2^64\n            inverse *= 2 - denominator * inverse; // inverse mod 2^128\n            inverse *= 2 - denominator * inverse; // inverse mod 2^256\n\n            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.\n            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is\n            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1\n            // is no longer required.\n            result = prod0 * inverse;\n            return result;\n        }\n    }\n\n    /**\n     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.\n     */\n    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {\n        uint256 result = mulDiv(x, y, denominator);\n        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {\n            result += 1;\n        }\n        return result;\n    }\n\n    /**\n     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.\n     *\n     * Inspired by Henry S. Warren, Jr.'s \"Hacker's Delight\" (Chapter 11).\n     */\n    function sqrt(uint256 a) internal pure returns (uint256) {\n        if (a == 0) {\n            return 0;\n        }\n\n        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.\n        //\n        // We know that the \"msb\" (most significant bit) of our target number `a` is a power of 2 such that we have\n        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.\n        //\n        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`\n        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`\n        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`\n        //\n        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.\n        uint256 result = 1 << (log2(a) >> 1);\n\n        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,\n        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at\n        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision\n        // into the expected uint128 result.\n        unchecked {\n            result = (result + a / result) >> 1;\n            result = (result + a / result) >> 1;\n            result = (result + a / result) >> 1;\n            result = (result + a / result) >> 1;\n            result = (result + a / result) >> 1;\n            result = (result + a / result) >> 1;\n            result = (result + a / result) >> 1;\n            return min(result, a / result);\n        }\n    }\n\n    /**\n     * @notice Calculates sqrt(a), following the selected rounding direction.\n     */\n    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {\n        unchecked {\n            uint256 result = sqrt(a);\n            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);\n        }\n    }\n\n    /**\n     * @dev Return the log in base 2, rounded down, of a positive value.\n     * Returns 0 if given 0.\n     */\n    function log2(uint256 value) internal pure returns (uint256) {\n        uint256 result = 0;\n        unchecked {\n            if (value >> 128 > 0) {\n                value >>= 128;\n                result += 128;\n            }\n            if (value >> 64 > 0) {\n                value >>= 64;\n                result += 64;\n            }\n            if (value >> 32 > 0) {\n                value >>= 32;\n                result += 32;\n            }\n            if (value >> 16 > 0) {\n                value >>= 16;\n                result += 16;\n            }\n            if (value >> 8 > 0) {\n                value >>= 8;\n                result += 8;\n            }\n            if (value >> 4 > 0) {\n                value >>= 4;\n                result += 4;\n            }\n            if (value >> 2 > 0) {\n                value >>= 2;\n                result += 2;\n            }\n            if (value >> 1 > 0) {\n                result += 1;\n            }\n        }\n        return result;\n    }\n\n    /**\n     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.\n     * Returns 0 if given 0.\n     */\n    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {\n        unchecked {\n            uint256 result = log2(value);\n            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);\n        }\n    }\n\n    /**\n     * @dev Return the log in base 10, rounded down, of a positive value.\n     * Returns 0 if given 0.\n     */\n    function log10(uint256 value) internal pure returns (uint256) {\n        uint256 result = 0;\n        unchecked {\n            if (value >= 10 ** 64) {\n                value /= 10 ** 64;\n                result += 64;\n            }\n            if (value >= 10 ** 32) {\n                value /= 10 ** 32;\n                result += 32;\n            }\n            if (value >= 10 ** 16) {\n                value /= 10 ** 16;\n                result += 16;\n            }\n            if (value >= 10 ** 8) {\n                value /= 10 ** 8;\n                result += 8;\n            }\n            if (value >= 10 ** 4) {\n                value /= 10 ** 4;\n                result += 4;\n            }\n            if (value >= 10 ** 2) {\n                value /= 10 ** 2;\n                result += 2;\n            }\n            if (value >= 10 ** 1) {\n                result += 1;\n            }\n        }\n        return result;\n    }\n\n    /**\n     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.\n     * Returns 0 if given 0.\n     */\n    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {\n        unchecked {\n            uint256 result = log10(value);\n            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);\n        }\n    }\n\n    /**\n     * @dev Return the log in base 256, rounded down, of a positive value.\n     * Returns 0 if given 0.\n     *\n     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.\n     */\n    function log256(uint256 value) internal pure returns (uint256) {\n        uint256 result = 0;\n        unchecked {\n            if (value >> 128 > 0) {\n                value >>= 128;\n                result += 16;\n            }\n            if (value >> 64 > 0) {\n                value >>= 64;\n                result += 8;\n            }\n            if (value >> 32 > 0) {\n                value >>= 32;\n                result += 4;\n            }\n            if (value >> 16 > 0) {\n                value >>= 16;\n                result += 2;\n            }\n            if (value >> 8 > 0) {\n                result += 1;\n            }\n        }\n        return result;\n    }\n\n    /**\n     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.\n     * Returns 0 if given 0.\n     */\n    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {\n        unchecked {\n            uint256 result = log256(value);\n            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);\n        }\n    }\n}\n"
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