private String sort(MemoriCommand command, GoogleSync googleSync) {
    Boolean[] f_values = command.getMemoriField();

    for (int i = 0; i < f_values.length; i++) {
      if (f_values[i] == Boolean.TRUE) {
        if (i == 0) {
          memoriCalendar.sort(MemoriEvent.nameComparator);
        } else if (i == 1) {
          memoriCalendar.sort(MemoriEvent.startDateComparator);
        } else if (i == 2) {
          memoriCalendar.sort(MemoriEvent.endDateComparator);
        } else if (i == 3) {
          memoriCalendar.sort(MemoriEvent.descriptionComparator);
        } else {
          memoriCalendar.sort(MemoriEvent.locationComparator);
        }
      }
    }
    return MESSAGE_SORT;
  }