public void LongestWord_1()
        {
            var solution = new _0720_LongestWordInDictionary();
            var result   = solution.LongestWord(new string[] { "w", "wo", "wor", "worl", "world" });

            Assert.AreEqual("world", result);
        }
        public void LongestWord_2()
        {
            var solution = new _0720_LongestWordInDictionary();
            var result   = solution.LongestWord(new string[] { "a", "banana", "app", "appl", "ap", "apply", "apple" });

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