code: public static Emoji getByUnicode(String unicode) {
      if (unicode == null) {
        return null;
      }
      return EMOJI_TRIE.getEmoji(unicode);
    }
docs: Returns the {@link com.vdurmont.emoji.Emoji} for a given unicode.
  
  @param unicode the the unicode
  
  @return the associated {@link com.vdurmont.emoji.Emoji}, null if the
  unicode is unknown