using System;

using Xunit;

​

​

    using System;

​

    public static class StringExtensions

    {

        public static bool IsPalindrom(this string x)

        {

            //TODO

            throw new NotImplementedException();

        }

    }

​

    public class Tests

    {

        [Fact]

        public void Test_IsPalindrom()

        {

            Assert.True("kajak".IsPalindrom());

            Assert.False("abcdef".IsPalindrom());

            Assert.True("abba".IsPalindrom());

            Assert.True("".IsPalindrom());

            Assert.False("ababb".IsPalindrom());

            Assert.False("aA".IsPalindrom());

        }

    }

​

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}