const int pins[] = { 13 , 12 , 11};

const int startingPosition = 0;
int currentPosition;

void setup() {
  // put your setup code here, to run once:

  for ( int i = 0 ; i < 3 ; i++){
      pinMode(pins[i] , OUTPUT);
  }
  currentPosition = 2;
  moveLED(currentPosition);
}

void loop() {
  // int lastPosition 
  // put your main code here, to run repeatedly:
  // for ( int i = 0 ; i < 3 ; i++){
  //     digitalWrite(pins[i] , HIGH);
  //     delay(1000);
  //     digitalWrite(pins[i] , LOW);
  // }
  //   for ( int i = 2 ; i >= 0 ; i--){
  //     digitalWrite(pins[i] , HIGH);
  //     delay(1000);
  //     digitalWrite(pins[i] , LOW);
  // }

  // if(currentPosition)


  delay(2000);
  int newPosition = moveLeft(currentPosition);
  moveLED(newPosition);
  currentPosition = newPosition;
  

}

  int moveRight(int currentPosition){
    return currentPosition + 1 ;
  }

  int moveLeft(int currentPosition){
    return currentPosition - 1 ;
  }

  void moveLED(int position){
    digitalWrite(pins[position] , HIGH);
  }