#define red 11
#define yellow 13
void setup() {
  // put your setup code here, to run once:
  pinMode(red, OUTPUT);
  pinMode(yellow, OUTPUT);
  pinMode(0, INPUT);
  pinMode(1, INPUT);
  digitalWrite(red, LOW);
  digitalWrite(yellow, LOW);
  Serial.end();
}

void switchState(int piin){
  if(digitalRead(piin) == LOW) {
    digitalWrite(piin, HIGH);
    delay(100);
  }
  else{
    digitalWrite(piin, LOW);
    delay(100);
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(0) == LOW){
    switchState(red);
  }
  if(digitalRead(1) == LOW){
    switchState(yellow);
  }
  delay(100);
  
}