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using System;

internal class Program
{
    private static void Main(string[] args)
    {
        string s = "This is a test";

        Console.WriteLine("Word count: {0}" ,s.WordCount());
        Console.WriteLine(s.Concatenate(" baby"));
        Console.ReadLine();
    }
}

using System.Linq;

public static class MyAwesomeExtensions
{
    public static int WordCount(this string input)
    {
        return input.Split(' ').Count();
    }


    public static string Concatenate(this string input, string toAdd)
    {
        return input + toAdd;
    }

    public static bool IsNullOrEmpty(this string s)
    {
        return string.IsNullOrEmpty(s);
    }
}