code: public static Emoji getForAlias(String alias) {
      if (alias == null) {
        return null;
      }
      return EMOJIS_BY_ALIAS.get(trimAlias(alias));
    }
docs: Returns the {@link com.vdurmont.emoji.Emoji} for a given alias.
  
  @param alias the alias
  
  @return the associated {@link com.vdurmont.emoji.Emoji}, null if the alias
  is unknown