hello_eth.sol

pragma solidity ^0.4.0;

contract HelloEthereum {
    string storedData;
    
    function set (string name) {
        storedData = name;
    }
    
    // function concatString(string a, string b) constant returns (string) {
    //     // TODO
    //     return a;
    // }
    
    function get() constant returns (string) {
        return storedData;
    }
    
}

For random people finding this gist and baffled why it's pinned on my gh profile: This was some example Solidity I wrote back in 2017. I sent this to a friend to show them how easy it was to write a smart contract on Ethereum. This was in Solidity 0.4.0, released in September of 2016. It was before Sol libraries and before proper string support. I feel like it's pretty nifty.

https://blog.soliditylang.org/2016/09/08/solidity-0.4.0-release-announcement/