code: private String removeUsernameFromCommandIfNeeded(String command) {
          if (allowCommandsWithUsername) {
              return command.replace("@" + botUsername, "").trim();
          }
          return command;
      }
docs: if {@link #allowCommandsWithUsername} is enabled, the username of the bot is removed from
  the command
  @param command Command to simplify
  @return Simplified command