gistfile1.txt

public static string FizzBuzz(int n)
{
    var fizz = Test(3, "fizz");
    var buzz = Test(5, "buzz");
    return fizz(buzz(x => x))(n.ToString());
    Func<Func<string, string>, Func<string, string>> Test(int d, string s) =>
        x => n % d == 0 ? _ => s + x("") : x;
}