void setup() {
pinMode(22,OUTPUT);
pinMode(21, OUTPUT);
pinMode(19,INPUT_PULLUP);

}

void loop() {
  int button_state = digitalRead(19);
  if (button_state == LOW)
  {
  digitalWrite(22,HIGH);
  digitalWrite(21, LOW);
  }

  else
  {
    digitalWrite(22,LOW);
    digitalWrite(21,HIGH);
  }

}