public void TestMethod7()
        {
            //Arrange
            int n1       = 55;
            int n2       = 20;
            int expected = 5;
            //Act
            int actual = Challenge104.GCD(n1, n2);

            //Assert
            Assert.AreEqual(actual, expected);
        }
        public void TestMethod6()
        {
            //Arrange
            int n1       = 17;
            int n2       = 100;
            int expected = 1;
            //Act
            int actual = Challenge104.GCD(n1, n2);

            //Assert
            Assert.AreEqual(actual, expected);
        }