code: def most_recent(path, startswith=None, endswith=None):
      
      candidate_files = []
      for filename in all_files_in_directory(path):
          if startswith and not os.path.basename(filename).startswith(startswith):
              continue
          if endswith and not filename.endswith(endswith):
              continue
          candidate_files.append({'name': filename, 'modtime': os.path.getmtime(filename)})
  
      # Return the most recent modtime
      most_recent = sorted(candidate_files, key=lambda k: k['modtime'], reverse=True)
      return most_recent[0]['name'] if most_recent else None
docs: Recursively inspect all files under a directory and return the most recent
  
          Args:
              path (str): the path of the directory to traverse
              startswith (str): the file name start with (optional)
              endswith (str): the file name ends with (optional)
          Returns:
              the most recent file within the subdirectory