public static void CountWord()
        {
            Console.Clear();
            Console.WriteLine("Welcome, please enter a sentence and a word to check the occurence of your word in your sentence.");
            Console.Write("Enter a sentence: ");
            string userSentence = Console.ReadLine().ToLower();

            Console.Write("Enter a word: ");
            string        userWord     = Console.ReadLine().ToLower();
            RepeatCounter newUserInput = new RepeatCounter(userWord, userSentence);

            if (RepeatCounter.CheckValidInput() == true)
            {
                Console.WriteLine($"Your word \"{userWord}\" appears {RepeatCounter.SearchWords()} times in your sentence.");
            }
            else
            {
                Console.WriteLine($"Your word \"{userWord}\" does not exist in your sentence \"{userSentence}\"");
            }
        }