class UserUtil {

  public static List<Map<String, String>> copyAndConvertExternalIdsToLower(
      List<Map<String, String>> externalIds) {
    List<Map<String, String>> list = new ArrayList<>();
    if (CollectionUtils.isNotEmpty(externalIds)) {
      storeOriginalExternalIdsValue(externalIds);
      list = convertExternalIdsValueToLowerCase(externalIds);
    }
    return list;
  }

  private  UserUtil();

}