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Palindrome within palindrome in c sharp #

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication6
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = Console.ReadLine();
            int i, j;
            string s2 = "",s3="";
       
            for (i = 0; i < s.Length; i++)
            {
                s2 = "";
                s2 = s[i].ToString();
                for (j = i + 1; j < s.Length; j++)
                {
                    s2 += s[j];
                    s3 = rev(s2.Trim());

                        if(s2.Equals(s3))
                        {Console.WriteLine(s2);
                        }

                }
            }
            Console.ReadKey();
        }
        static string rev(String s)
        {
            string s3="";
            for (int i = 0; i < s.Length; i++)
                s3 = s[i] + s3;

                return s3;
        }
    }
}

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