old_contents: """
   Simple DHCP Server
  """
  
new_contents: """
   Simple DHCP Server
  """
  
  class DHCPServer():
  
      def handle_dhcp_request(self):
  
      def handle_dhcp_offer(self):
  
      def handle_dhcp_ack(self):  
  
subject: add DHCPServer class.