contract EIP20Factory {
    mapping(address => address[]) public created;

    mapping(address => bool) public isEIP20; //verify without having to do a bytecode check.

    bytes public EIP20ByteCode; // solhint-disable-line var-name-mixedcase



    function EIP20Factory() public {

        //upon creation of the factory, deploy a EIP20 (parameters are meaningless) and store the bytecode provably.

         address verifiedToken = createEIP20(600000000000000000, "HUNDREDMEDICINECASH", 8, "HMCA");

        EIP20ByteCode = codeAt(verifiedToken);

    }



    //verifies if a contract that has been deployed is a Human Standard Token.

    //NOTE: This is a very expensive function, and should only be used in an eth_call. ~800k gas

    function verifyEIP20(address _tokenContract) public view returns (bool) {

        bytes memory fetchedTokenByteCode = codeAt(_tokenContract);



        if (fetchedTokenByteCode.length != EIP20ByteCode.length) {

            return false; //clear mismatch

        }



      //starting iterating through it if lengths match

        for (uint i = 0; i < fetchedTokenByteCode.length; i++) {

            if (fetchedTokenByteCode[i] != EIP20ByteCode[i]) {

                return false;

            }

        }

        return true;

    }



    function createEIP20(uint256 _initialAmount, string _name, uint8 _decimals, string _symbol)

        public

    returns (address) {



        EIP20 newToken = (new EIP20(_initialAmount, _name, _decimals, _symbol));

        created[msg.sender].push(address(newToken));

        isEIP20[address(newToken)] = true;

        //the factory will own the created tokens. You must transfer them.

        newToken.transfer(msg.sender, _initialAmount);

        return address(newToken);

    }



    //for now, keeping this internal. Ideally there should also be a live version of this that

    // any contract can use, lib-style.

    //retrieves the bytecode at a specific address.

    function codeAt(address _addr) internal view returns (bytes outputCode) {

        assembly { // solhint-disable-line no-inline-assembly

            // retrieve the size of the code, this needs assembly

            let size := extcodesize(_addr)

            // allocate output byte array - this could also be done without assembly

            // by using outputCode = new bytes(size)

            outputCode := mload(0x40)

            // new "memory end" including padding

            mstore(0x40, add(outputCode, and(add(add(size, 0x20), 0x1f), not(0x1f))))

            // store length in memory

            mstore(outputCode, size)

            // actually retrieve the code, this needs assembly

            extcodecopy(_addr, add(outputCode, 0x20), 0, size)

        }

    }

}
function verifyEIP20(address _tokenContract) public view returns (bool) {

    bytes memory fetchedTokenByteCode = codeAt(_tokenContract);



    if (fetchedTokenByteCode.length != EIP20ByteCode.length) {

        return false; //clear mismatch

    }



  //starting iterating through it if lengths match

    for (uint i = 0; i < fetchedTokenByteCode.length; i++) {

        if (fetchedTokenByteCode[i] != EIP20ByteCode[i]) {

            return false;

        }

    }

    return true;

}

//verifies if a contract that has been deployed is a Human Standard Token.
//NOTE: This is a very expensive function, and should only be used in an eth_call. ~800k gas