[Ethereum] Solidity: data type conversion from bytes to address/string/uint/int [ any library available? ]

I have a method which returns bytes type data from an external contract call. I need to convert that bytes type data into my desired output type data like address/uint/bool/string/int etc. I have tried finding conversion library but couldn't find any.
Note if I convert the bytes as a string like this string(returnData) the address type data got converted into something I'm unable to decode it. the same thing happens for another data type as well.

function getData(string memory _key) public returns (string memory _stringData, address _addressData, uint _uintData, bytes memory _bytesData, bool _boolData) {

    Delegate _delegate = Delegate(MAN.getLatestDelegateContract()); // this is my own internal machanism, skip thi please 
    // Retrieve method name according to data type
    string memory _methodName = _delegate.getDataType(_key);
    // Prepare input call
    bytes memory _input = abi.encodePacked(bytes4(keccak256(abi.encodePacked("get",_methodName,"(bytes32)"))),keccak256(abi.encodePacked(_key)));
    // Make the call
    (bool success, bytes memory ret) = address(deployedEternalStorages).call(_input);
        // from the call data returned as bytes

        if (success) {
        // Return data as desired type
        if(keccak256(abi.encodePacked(_methodName)) == keccak256("address")){
            //convert bytes to address and assign into below variable
            //_addressData = 
        }
        else if(keccak256(abi.encodePacked(_methodName)) == keccak256("uint")){
            //convert bytes to uint and assig into below variable
            //_uintData = 
        }
        else if(keccak256(abi.encodePacked(_methodName)) == keccak256("bytes")){
            _bytesData = ret;
        }
        else if(keccak256(abi.encodePacked(_methodName)) == keccak256("bool")){
            //convert bytes to bool and assig into below variable
            //_boolData = 
        }
        else{
            _stringData = string(ret);
        }
    } else {
        // Call failed revert
        revert();
    }
}

Can anybody help with any conversion library or any other way to convert the data types. Note: I'm using 0.5.0 version in my code.