private static @NotNull String generateRandomSequence() {
    int length = ERROR_COUNT.get() % (MAX_SEPARATOR_LENGTH - RECORD_START.length());
    StringBuilder tail = new StringBuilder();
    for (int i = 0; i < length; i++) {
      int randomIndex = ThreadLocalRandom.current().nextInt(0, CONTROL_CHARS.length);
      tail.append(CONTROL_CHARS[randomIndex]);
    }
    return tail.toString();
  }
private static @NotNull String generateRandomSequence()