public void Test2()
        {
            ReverseNoSpecialChars r = new ReverseNoSpecialChars();
            var actual = r.Reverse("Ab,c,de!$");

            Assert.That(actual, Is.EqualTo("ed,c,bA!$"));
        }
        public void Test3(string input, string output)
        {
            ReverseNoSpecialChars r = new ReverseNoSpecialChars();
            var actual = r.Reverse(input);

            Assert.That(actual, Is.EqualTo(output));
        }
        public void Test1()
        {
            ReverseNoSpecialChars r = new ReverseNoSpecialChars();
            var actual = r.Reverse("a,b$c");

            Assert.That(actual, Is.EqualTo("c,b$a"));
        }