old_contents: import dogecoinrpc
  
  
  connection = dogecoinrpc.connect_to_local()
  
  
  def generate_address():
      return connection.getnewaddress()
  
  
  def check_balance(addr):
      return connection.getbalance(addr)
  
new_contents: import dogecoinrpc
  
  
  connection = dogecoinrpc.connect_to_local()
  
  
  def get_cost():
      return 0
  
  
  def generate_address():
      return connection.getnewaddress()
  
  
  def check_balance(addr):
      return connection.getbalance(addr)
  
subject: Add a stub method