text: """ Functions to fix off file headers """ 
  from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  
  from multiprocessing import Pool
  from ocnn.utils.file_utils import find_files
  
  def clean_off_file(file_name):
      """  Fixes header of OFF file
      Args:
        file_name (str): Name of file to fix
      """
      file_cleaned = False
      with open(file_name) as f_check:
          file_str = f_check.read()
          if file_str[0:3] != 'OFF':
              raise AttributeError('Unexpected Header for {0}'.format(file_name))
          elif file_str[0:4] != 'OFF\n':
              new_str = file_str[0:3] + '\n' + file_str[3:]
              with open(file_name, 'w') as f_rewrite:
                  f_rewrite.write(new_str)
              file_cleaned = True
      return file_cleaned
  
  def clean_off_folder(input_folder):
      """ Fixes headers of all OFF files in a given folder.
      Args:
        input_folder (str): Folder to search for off files
      """
      executor = Pool()
      file_list = find_files(input_folder, '*.[Oo][Ff][Ff]')
  
      files_cleaned_list = executor.map(clean_off_file, file_list)
      num_files_cleaned = 0
      for file_cleaned in files_cleaned_list:
          if file_cleaned:
              num_files_cleaned += 1
      print("{0} out of {1} files cleaned".format(num_files_cleaned, len(files_cleaned_list)))
  
  