code: private final boolean isAlone(
          String tagName,
          String aloneTags[]
      ) {
          if (aloneTags == null)
              return false;
  
          if (tagName == null)
              return false;
  
          for (int i = 0; i < aloneTags.length; i++) {
              if (tagName.equalsIgnoreCase(aloneTags[i]))
                  return true;
          }
  
          return false;
      }
docs: return true if the given tag name is an empty tag
  
  @param tagName tag name to lookup
  @param aloneTags a string array of empty tags
  
  @return true if the given tag name is an empty tag