originalString = Strings.repeat("x", length);
  }

  @Benchmark
  void oldRepeat(long reps) {
    for (int i = 0; i < reps; i++) {
      String x = oldRepeat(originalString, count);
      if (x.length() != (originalString.length() * count)) {
        throw new RuntimeException("Wrong length: " + x);
      }
    }
  }

  private static String oldRepeat(String string, int count) {

    originalString = Strings.repeat("x", length);
  }

  @Benchmark
  void oldRepeat(long reps) {
    for (int i = 0; i < reps; i++) {
      String x = oldRepeat(originalString, count);
      if (x.length() != (originalString.length() * count)) {
        throw new RuntimeException("Wrong length: " + x);
      }
    }
  }

  private static String oldRepeat(String string, int count) {