Solidity String轉byte32 byte轉String

 /// string型別轉化為bytes32型轉
    function stringToBytes32(string memory source) constant internal returns(bytes32 result){
        assembly{
            result := mload(add(source,32))
        }
    }

  /// bytes32型別轉化為string型轉
    function bytes32ToString(bytes32 x) constant internal returns(string){
        bytes memory bytesString = new bytes(32);
        uint charCount = 0 ;
        for(uint j = 0 ; j<32;j++){
            byte char = byte(bytes32(uint(x) *2 **(8*j)));
            if(char !=0){
                bytesString[charCount] = char;
                charCount++;
            }
        }
        bytes memory bytesStringTrimmed = new bytes(charCount);
        for(j=0;j<charCount;j++){
            bytesStringTrimmed[j]=bytesString[j];
        }
        return string(bytesStringTrimmed);
    }