@NotNull
    private static Queue<String> createFilesToDelete() {
      final ConcurrentLinkedQueue<String> queue = new ConcurrentLinkedQueue<>();
      Runtime.getRuntime().addShutdownHook(new Thread("FileUtil deleteOnExit") {
        @Override
        public void run() {
          String name;
          while ((name = queue.poll()) != null) {
            delete(new File(name));
          }
        }
      });
      return queue;
    }
@NotNull
    private static Queue<String> createFilesToDelete()