Write a C# Sharp program to create a new string from a given string without the first and last character if the first or last characters are 'a' otherwise return the original given string

using System;

namespace exercises
{
   class Program
    {       
        static void Main(string[] args)
        {
            Console.WriteLine(test("abcab"));
            Console.WriteLine(test("python"));
            Console.WriteLine(test("abcda"));
            Console.WriteLine(test("jython"));
           
            Console.ReadLine();
        }

    public static string test(string s1)
          {
          if (s1.Length > 0 && s1.Substring(s1.Length - 1) == "a")
            {
                s1 = s1.Remove(s1.Length - 1);
            }

            if (s1.Length > 0 && s1.Substring(0, 1) == "a")
            {
                s1 = s1.Remove(0, 1);
            }

            return s1;
          }    
   }
}