using System;

​

public class Program

{

    public static void Main()

    {

        string bob = "Bob";

        Console.WriteLine(bob.BomBoozle());

        string nobody = null;

        Console.WriteLine(nobody.BomBoozle());

    }

}

​

public static class Extension

{

    public static string BomBoozle(this string source)

    {

        return string.Concat(source, " is BomBoozled!");

    }

}