static void Main(string[] args)
        {
            StringBuilder tempPal = null;
            List<string> pd = new List<string> { };            
            string input = "FourscoreandsevenyearsagoourfaathersbroughtforthonthiscontainentanewnationconceivedinzLibertyanddedicatedtothepropositionthatallmenarecreatedequalNowweareengagedinagreahtcivilwartestingwhetherthatnaptionoranynartionsoconceivedandsodedicatedcanlongendureWeareqmetonagreatbattlefiemldoftzhatwarWehavecometodedicpateaportionofthatfieldasafinalrestingplaceforthosewhoheregavetheirlivesthatthatnationmightliveItisaltogetherfangandproperthatweshoulddothisButinalargersensewecannotdedicatewecannotconsecratewecannothallowthisgroundThebravelmenlivinganddeadwhostruggledherehaveconsecrateditfaraboveourpoorponwertoaddordetractTgheworldadswfilllittlenotlenorlongrememberwhatwesayherebutitcanneverforgetwhattheydidhereItisforusthelivingrathertobededicatedheretotheulnfinishedworkwhichtheywhofoughtherehavethusfarsonoblyadvancedItisratherforustobeherededicatedtothegreattdafskremainingbeforeusthatfromthesehonoreddeadwetakeincreaseddevotiontothatcauseforwhichtheygavethelastpfullmeasureofdevotionthatweherehighlyresolvethatthesedeadshallnothavediedinvainthatthisnationunsderGodshallhaveanewbirthoffreedomandthatgovernmentofthepeoplebythepeopleforthepeopleshallnotperishfromtheearth";

            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < input.Length; i++)
            {
                if (i % 1 == 0)
                    sb.Append(' ');
                sb.Append(input[i]);
            }
            string formatted = sb.ToString();

            string[] bigString = formatted.ToString().Split(' ');

            for (int i = 1; i < bigString.Length; i++)
            {                
                tempPal = new StringBuilder();
                string firstLetter = bigString[i];
                tempPal.Append(firstLetter);
                string testPal = "";
                for (int j = i + 1; j < bigString.Length; j++)
                {
                    testPal = tempPal.ToString() + bigString[j];
                    if (testPal == Reverse(testPal))
                    {
                        pd.Add(testPal);
                    }
                    tempPal.Append(bigString[j]);
                }
                tempPal = null;
            }
            string longest= "";
            for(int i = 0; i<pd.Count; i++)
            {
                if (pd[i].Length > longest.Length)
                {
                    longest = pd[i];
                }
                
            }
            Console.WriteLine(longest);
            Console.ReadKey();
        }

        public static string Reverse(string s)
        {
            char[] arr = s.ToCharArray();
            Array.Reverse(arr);
            return new string(arr);
        }