public void TestWithHi()
        {
            GreetController greetController = new GreetController();

            Assert.Equal("Hello", greetController.Talk("hi"));
        }
        public void TestWithOthers()
        {
            GreetController greetController = new GreetController();

            Assert.Equal("I dont know what you are saying", greetController.Talk("Abc"));
        }