contract HumanStandardToken is StandardToken {

    function () external {
        //if ether is sent to this address, send it back.
        revert();
    }

    /* Public variables of the token */

    /*
    NOTE:
    The following variables are OPTIONAL vanities. One does not have to include them.
    They allow one to customise the token contract & in no way influences the core functionality.
    Some wallets/interfaces might not even bother to look at this information.
    */
    string public name;                   //fancy name: eg Simon Bucks
    uint8 public decimals;                //How many decimals to show. ie. There could 1000 base units with 3 decimals. Meaning 0.980 SBX = 980 base units. It's like comparing 1 wei to 1 ether.
    string public symbol;                 //An identifier: eg SBX
    string public version = 'H0.1';       //human 0.1 standard. Just an arbitrary versioning scheme.
    address public owner;

    event Burn(address indexed _owner, uint256 _value);
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor(
        uint256 _initialAmount,
        string memory _tokenName,
        uint8 _decimalUnits,
        string memory _tokenSymbol
        ) public {
        balances[msg.sender] = _initialAmount;               // Give the creator all initial tokens
        _totalSupply = _initialAmount;                        // Update total supply
        name = _tokenName;                                   // Set the name for display purposes
        decimals = _decimalUnits;                            // Amount of decimals for display purposes
        symbol = _tokenSymbol;                               // Set the symbol for display purposes
        owner = msg.sender;
        emit Transfer(address(0), msg.sender, _totalSupply);
        emit OwnershipTransferred(address(0), owner);
    }

    /* Approves and then calls the receiving contract */
    function approveAndCall(address _spender, uint256 _value, bytes memory _extraData) public returns (bool success) {
        tokenRecipient spender = tokenRecipient(_spender);
        if (approve(_spender, _value)) {
            spender.receiveApproval(msg.sender, _value, address(this), _extraData);
            return true;
        }
    }

    /**
     * @dev Burns a specific amount of tokens.
     * @param _value The amount of token to be burned.
    */
    function burn(uint256 _value) public {
        require(msg.sender == owner);
        require(_value <= balances[msg.sender]);
        require(_value <= _totalSupply);
        // no need to require value <= totalSupply, since that would imply the
        // sender's balance is greater than the totalSupply, which *should* be an assertion failure
        balances[msg.sender] -= _value;
        _totalSupply -= _value;
        emit Transfer(msg.sender, address(0), _value);
        emit Burn(msg.sender, _value);
    }

    /**
     * @dev Transfers control of the contract to a newOwner.
     * @param newOwner The address to transfer ownership to.
     */
    function transferOwnership(address newOwner) public {
        require(msg.sender == owner);
        require(newOwner != address(0), "Cannot transfer control of the contract to zero address");
        emit OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }
}
/*
 This Token Contract implements the standard token functionality (https://github.com/ethereum/EIPs/issues/20) as well as the following OPTIONAL extras intended for use by humans.
 
 In other words. This is intended for deployment in something like a Token Factory or Mist wallet, and then used by humans.
 Imagine coins, currencies, shares, voting weight, etc.
 Machine-based, rapid creation of many tokens would not necessarily need these extra features or will be minted in other manners.
 
 1) Initial Finite Supply (upon creation one specifies how much is minted).
 2) In the absence of a token registry: Optional Decimal, Symbol & Name.
 3) Optional approveAndCall() functionality to notify a contract if an approval() has occurred.
 
 .*/
function burn(uint256 _value) public {
        require(msg.sender == owner);
        require(_value <= balances[msg.sender]);
        require(_value <= _totalSupply);
        // no need to require value <= totalSupply, since that would imply the
        // sender's balance is greater than the totalSupply, which *should* be an assertion failure
        balances[msg.sender] -= _value;
        _totalSupply -= _value;
        emit Transfer(msg.sender, address(0), _value);
        emit Burn(msg.sender, _value);
    }
/**
 * @dev Burns a specific amount of tokens.
 * @param _value The amount of token to be burned.
 */