pragma solidity ^0.4.4;

contract HelloEthSalon {
    string message = "I know smart contract testing!!";

    function HelloEthSalon() public {
        // constructor
    }

    function SetMessage(string m) public {
        require(bytes(m).length > 0);
        message = m;
    }

    function GetMessage() public returns (string) {
        return message;
    }
}