public void IsUnique(string str, bool expected)
        {
            QuestionsOnStrings obj = new QuestionsOnStrings();

            var result = obj.IsPalindrome(str.ToLower());

            Assert.AreEqual(result, expected);
        }
        public void CountNumberOfWordsInStringTest(string str, int expected)
        {
            QuestionsOnStrings obj = new QuestionsOnStrings();

            var result = obj.CountNumberOfWordsInString(str);

            Assert.AreEqual(result, expected);
        }
        public void DetermineAnagramsOfTwoWords(string word1, string word2, bool expected)
        {
            QuestionsOnStrings obj = new QuestionsOnStrings();

            var result = obj.DetermineAnagramsOfTwoWords(word1, word2);

            Assert.AreEqual(result, expected);
        }
        public void ReverseStrinTest(string word, string expected)
        {
            QuestionsOnStrings obj = new QuestionsOnStrings();

            var result = obj.ReverseString(word);

            Assert.AreEqual(result.ToLower(), expected.ToLower());
        }
        public void RemoveDuplicateCharsTest(string input, string expected)
        {
            QuestionsOnStrings obj = new QuestionsOnStrings();

            var result = obj.RemoveDuplicateChars(input);

            Assert.AreEqual(result, expected);
        }