public void InsertNumber1()
        {
            int result = InsertNumberTask.InsertNumber(8, 15, 3, 8);

            Assert.AreEqual(120, result);
        }
        public void InsertNumber2()
        {
            int result = InsertNumberTask.InsertNumber(8, 15, 0, 0);

            Assert.AreEqual(9, result);
        }