Spinning fan with servo motor

const int buttonpin = 12;
const int motorpin = 9;
boolean lastbutton = false;
boolean currentbutton = false;
boolean motorOn = false;



void setup()
{
  pinMode (lastbutton, INPUT);
  pinMode (motorpin, OUTPUT);
  Serial.begin (9600);
  }
boolean debounce (boolean lastbutton)
{
  boolean currentbutton = digitalRead (buttonpin);
  if (lastbutton != currentbutton)//if lastbutton is different than currentbutton then delay for 5 milliseconds and read the currentbutton
  {
    delay (5);
    currentbutton = digitalRead (buttonpin);
  }
  return currentbutton;
}

void loop()
{
  currentbutton = debounce (lastbutton);
  if (lastbutton == LOW && currentbutton == HIGH)
  {
    motorOn =! motorOn;
  }
  digitalWrite (motorpin, motorOn);
  lastbutton = currentbutton;

}