gistfile1.txt

// See http://www.reddit.com/r/programming/comments/as759/hey_reddit_out_of_these_4_programmers_who_would/

using System;

class MainClass {
	static int Main(string[] argv) {
		foreach (string s in new string[] {"hello", "λ", Char.ConvertFromUtf32(0x1D161)}) {
			Console.WriteLine(s);
			Console.WriteLine(Reverse(s));
		}
		return 0;
	}

	// Candidate 3
	static string Reverse(string input)
	{
		char[] chars = input.ToCharArray();
		Array.Reverse(chars);
		return new String(chars);
	}
}
// Output - hello and λ work as expected, 0x1D161 is a musical note symbol which gets trashed on reversing.