public void FindFirstUniqueCharacterInString()
 {
     Assert.AreEqual(0, P387FirstUniqueCharacterInString.FirstUniqChar("leetcode"));
     Assert.AreEqual(2, P387FirstUniqueCharacterInString.FirstUniqChar("loveleetcode"));
 }
 public void FindNoUniqueCharacterInEmptyString()
 {
     Assert.AreEqual(-1, P387FirstUniqueCharacterInString.FirstUniqChar(""));
 }