int led1 = 3;
int led2 = 4;
int switchPin = 5;
int nextPin = 6;
int repeatPin = 7;

int lastEffect = 0; // Add a new variable to keep track of the last effect

void setup() {
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(switchPin, INPUT_PULLUP);
  pinMode(nextPin, INPUT_PULLUP);
  pinMode(repeatPin, INPUT_PULLUP);
}

void loop() {
  if (digitalRead(switchPin) == LOW) {
    effect1 ();
    lastEffect = 1; // Set the last effect variable to 1
  }
  else if (digitalRead(nextPin) == LOW) {
    if (lastEffect == 1) {
      effect2 ();
      lastEffect = 2; // Set the last effect variable to 2
    }
    else {
      effect1 ();
      lastEffect = 1; // Set the last effect variable to 1
    }
  }
  else if (digitalRead(repeatPin) == LOW) {
    if (lastEffect == 1) {
      effect1 ();
    }
    else {
      effect2 ();
    }
  }
}

void effect1() {
  digitalWrite(led1, HIGH);
  digitalWrite(led2, LOW);
  delay(500);
  digitalWrite(led1, LOW);
  digitalWrite(led2, HIGH);
  delay(500);
  digitalWrite(led2, LOW);
}

void effect2() {
  digitalWrite(led1, HIGH);
  digitalWrite(led2, HIGH);
  delay(100);
  digitalWrite(led1, LOW);
  digitalWrite(led2, LOW);
  delay(100);
  digitalWrite(led1, HIGH);
  digitalWrite(led2, HIGH);
  delay(100);
  digitalWrite(led1, LOW);
  digitalWrite(led2, LOW);
}