const int led1 = 11;
const int led2 = 10;
const int led3 = 9;
const int button = 2;
int lastButton = LOW;
int curButton = LOW;
int curPosition = 0;

int debounce (int last)
{
  int current = digitalRead(button);
  if(last != current)
  {
    delay(5);
    current = digitalRead(button);
  }
  return current;
}

void setup() {
  pinMode(led1, OUTPUT);
  digitalWrite(led1, HIGH);
  pinMode(led2, OUTPUT);
  digitalWrite(led2, HIGH);
  pinMode(led3, OUTPUT);
  digitalWrite(led3, HIGH);
  pinMode(button, INPUT);
  digitalWrite(button, HIGH);
}

void loop() {
  curButton = debounce(lastButton);
  if(lastButton == HIGH && curButton == LOW)
  {
    curPosition = (curPosition+1) % 8;
    digitalWrite(led1, curPosition & 0x01 ? LOW : HIGH);
    digitalWrite(led2, curPosition & 0x02 ? LOW : HIGH);
    digitalWrite(led3, curPosition & 0x04 ? LOW : HIGH);
  }
  lastButton = curButton;
}