public void Test_FrontBackNumbers1_2()
        {
            var numTest = new Exercise1();
            var result  = numTest.FrontBackNumbers_Solution1(1234567890);

            Assert.AreEqual(1029384756, result);
        }
        public void Test_FrontBackNumbers1_1()
        {
            var numTest = new Exercise1();
            var result  = numTest.FrontBackNumbers_Solution1(123456789);

            Assert.AreEqual(192837465, result);
        }