public void AddStrings_1()
        {
            var solution = new _0415_AddStrings();
            var result   = solution.AddStrings("123", "987");

            Assert.AreEqual("1110", result);
        }
        public void AddStrings_2()
        {
            var solution = new _0415_AddStrings();
            var result   = solution.AddStrings("111", "1");

            Assert.AreEqual("112", result);
        }