code: def _remove_older_files_if_exists():
      """
      Helper method to prevent cache leakage when user attempts to upload another set of files
      without first transcribing the files already uploaded.
      """
      # remove old data store (if exists)
      old_uuid = secure_filename(request.cookies.get("uuid", ""))
      if old_uuid is not None and old_uuid != "":
          # delete old data store
          old_data_store = os.path.join(
              app.config[f"UPLOAD_FOLDER"], old_uuid
          )
  
          logging.info(
              "Tried uploading more data without using old uploaded data. Purging data cache."
          )
          shutil.rmtree(old_data_store, ignore_errors=True)
  
imports: import atexit
  import glob
  import os
  import shutil
  import time
  from html import unescape
  from uuid import uuid4
  import model_api
  import torch
  import werkzeug
  from flask import Flask, make_response, render_template, request, url_for
  from flask_cors import CORS
  from werkzeug.utils import secure_filename
  from nemo.utils import logging
label_desc: Use image node_id 4 for calling a global function with example usage: _remove_older_files_if_exists() without return types