public void TestMinimumLengthSubstring_3()
        {
            string s = "aabcba";
            string t = "ab";

            string expectedOutput = "ab";

            var output = MinimumLengthSubstringsV2.MinLengthSubstring(s, t);

            output.Should().Be(expectedOutput);
        }
        public void TestMinimumLengthSubstring_4()
        {
            string s = "ADOBECODEBANC";
            string t = "BANC";

            string expectedOutput = "BANC";

            var output = MinimumLengthSubstringsV2.MinLengthSubstring(s, t);

            output.Should().Be(expectedOutput);
        }
        public void TestMinimumLengthSubstring_2()
        {
            string s = "dcbefebcefdalksjdlaksjd";
            string t = "fd";

            string expectedOutput = "fd";

            var output = MinimumLengthSubstringsV2.MinLengthSubstring(s, t);

            output.Should().Be(expectedOutput);
        }