old_contents: """ Utilities to work with LaTeX files. """
  
  import re
  import requests
  import unicodedata
  import sys
  
  
  def read_latex_file(latex_file, encoding="utf-8"):
      with open(tex_file, 'r', encoding=encoding) as data:
          latex_source = data.read()
      return latex_source
  
  
  def write_latex_file(latex_file, latex_source):
      with open(latex_file, 'w') as open_file:
          open_file.write(latex_source)
  
  
  def get_relevant_warnings(log_file):
      """Extract relevant warnings from a LaTeX log file."""
      overfull_lines = re.findall(r"Overfull \\hbox .*", log_file)
      undefined_references = re.findall(r"LaTeX Warning: Citation `.*?' on page .*", log_file)
      return overfull_lines + undefined_references
  
  
  def remove_accented_characters(string):
      """Change accented characters to their ASCII equivalents."""
      return unicodedata.normalize('NFD', string).encode('ascii', 'ignore').decode('utf-8')
  
  
  def open_webpage(address, exit_on_error=True):
      """Return the request server response for a webpage."""
      try:
          server_response = requests.get(address, timeout=10)
          server_response.raise_for_status()
      except (requests.exceptions.Timeout, requests.exceptions.ConnectionError, requests.exceptions.HTTPError) as e:
          if exit_on_error:
              sys.exit(e)
          else:
              return f"failed ({e})"
      else:
          return server_response
  
new_contents: """ Utilities to work with LaTeX files. """
  
  import re
  import requests
  import unicodedata
  import sys
  
  
  def read_latex_file(latex_file, encoding="utf-8"):
      with open(latex_file, 'r', encoding=encoding) as data:
          latex_source = data.read()
      return latex_source
  
  
  def write_latex_file(latex_file, latex_source):
      with open(latex_file, 'w') as open_file:
          open_file.write(latex_source)
  
  
  def get_relevant_warnings(log_file):
      """Extract relevant warnings from a LaTeX log file."""
      overfull_lines = re.findall(r"Overfull \\hbox .*", log_file)
      undefined_references = re.findall(r"LaTeX Warning: Citation `.*?' on page .*", log_file)
      return overfull_lines + undefined_references
  
  
  def remove_accented_characters(string):
      """Change accented characters to their ASCII equivalents."""
      return unicodedata.normalize('NFD', string).encode('ascii', 'ignore').decode('utf-8')
  
  
  def open_webpage(address, exit_on_error=True):
      """Return the request server response for a webpage."""
      try:
          server_response = requests.get(address, timeout=10)
          server_response.raise_for_status()
      except (requests.exceptions.Timeout, requests.exceptions.ConnectionError, requests.exceptions.HTTPError) as e:
          if exit_on_error:
              sys.exit(e)
          else:
              return f"failed ({e})"
      else:
          return server_response
  
subject: Fix typo