public void Test5()
 {
     Assert.AreEqual(4, Substring.Solve("abdggggta"));
 }
 public void Test4()
 {
     Assert.AreEqual(1, Substring.Solve("aaaaaaa"));
 }
 public void Test2()
 {
     Assert.AreEqual(5, Substring.Solve("abadecb"));
 }
 public void Test3()
 {
     Assert.AreEqual(3, Substring.Solve("qavvaq"));
 }
 public void Test1()
 {
     Assert.AreEqual(5, Substring.Solve("abcde"));
 }