// Find duplicate words regardless of case

// Find duplicate word with its count 

​

​

using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        string input = "Hii My name is Safar safar Safar";

        // Here First i am creating a Dictoinary to store the fetched unique values from the string

        Dictionary<string, int> wordCount = new Dictionary<string, int>();

        int start = 0;

        int end = 0;

      // This while loop Will iterate untill the end of the string is reached..

        while (end <= input.Length)

        {

            // this Condition will split the word by space and goes till end of the string

            if (end == input.Length || char.IsWhiteSpace(input[end]))

            {

                // Here i am converting the string in to lower case and storing it inside the wordcount

                string word = input.Substring(start, end - start).ToLower();

                // If the Word is Already Exits in the list the count will increased by 1

                if (wordCount.ContainsKey(word))

                {

                    wordCount[word]++;

                }

                // else the count will be 1

                else

                {

                    wordCount[word] = 1;

                }

​

                start = end + 1;

            }

​

            end++;

        }

        // This will print the word with it's Count stored inside the Dictionary

​

        foreach (KeyValuePair<string, int> entry in wordCount)

        {

            if (entry.Value > 1)

            {

                Console.WriteLine("The word '{0}' is duplicated in this string", entry.Key);

            }

        }

​

        Console.ReadLine();

    }

    }

​