old_contents: from itertools import chain
  
  def normalize(str_input):
      return str_input.replace('&quot;', '"') \
                      .replace(';', ',')
  
  def options_to_dict(options):
      return dict(option.split("=") for option in options)
  
new_contents: def normalize(str_input):
      return str_input.replace('&quot;', '"') \
                      .replace(';', ',')
  
  def options_to_dict(options):
      return dict(option.split("=") for option in options)
  
subject: Remove unused import