public void RecursiveReverseStringTest3()
        {
            //Assign
            var input    = "123456789";
            var expected = "987654321";

            //Act
            var result = MySolution.RecursiveReverseString(input);

            //Assert
            Assert.AreEqual(result, expected, "The result differs from what is expected.");
        }
        public void RecursiveReverseStringTest2()
        {
            //Assign
            var input    = "hello world";
            var expected = "dlrow olleh";

            //Act
            var result = MySolution.RecursiveReverseString(input);

            //Assert
            Assert.AreEqual(result, expected, "The result differs from what is expected.");
        }