public void show_if_the_first_number_is_multiple_of_the_second_number(int firstNumber, int secondNumber, string expected)
        {
            // Dado / Setup
            var exercises = new Exercises1();

            // Quando / Ação
            string returnedValues = exercises.Exercise8(firstNumber, secondNumber);

            // Deve / Asserções
            Assert.Equal(expected, returnedValues);
        }