Write a C# Sharp program to create a new string using first two characters of a given string. If the string length is less than 2 then return the original string

using System;
namespace exercises
{
   class Program
    {       
        static void Main(string[] args)
        {
            Console.WriteLine(test("Hello"));
            Console.WriteLine(test("Hi"));
            Console.WriteLine(test("H"));
            Console.WriteLine(test(" "));
            Console.ReadLine();
        }
        public static string test(string s1)
         {
            return s1.Length < 2 ? s1 : s1.Substring(0, 2);
         }
  }
}