/*

write two String class extension methods that return strings:

​

1. .firstname()

​

    "Matt Keas".firstname() // "Matt"

    "John Henry Liberty".firstname() // "John"

​

2. .lastname()

​

    "Matt Keas".lastname() // "Keas"

    "John Henry Liberty".lastname() // "Liberty"

​

 */

using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

​

public static class Extensions {

    public static string[] words(this string s) => s.Split(new char[] { ' '} );

    public static string firstName(this string s) => s.words().First();

    public static string lastName(this string s) => s.words().Last();

​

}

​

public class Program {

    public static void Main(){

        Console.WriteLine("Hi there!");

        Console.WriteLine("Matt Keas".firstName());

        Console.WriteLine("John Henry Liberty".firstName());

        Console.WriteLine("Matt Keas".lastName());

        Console.WriteLine("John Henry Liberty".lastName());

        Console.WriteLine("Bono".lastName());

        Console.WriteLine("Bono".firstName());

        Console.WriteLine("    - -".lastName());

​

    }

}

​