   return "ok";
 }
 
-String checkBatteryStatus()
+String checkBatteryStatus(int argument)
 {
   return "battery status is " + String(random(0, 1));
 }

  return result;
}

String forward()
{
  turnMotorsOn();
  

  return "ok";
}

String backward(int argument)
{
  turnMotorsOn();
  
