Automation - 2

Notice that the two functions are basically the same.
The only thing that changes—flips—is the LEDs.
Once it’s 13, and once it’s 7.

const int TOUCH_SENSOR_PIN = 2;
const int LED_1_PIN = 13;
const int LED_2_PIN = 7;

void setup() {
  pinMode(TOUCH_SENSOR_PIN, INPUT);
  pinMode(LED_1_PIN, OUTPUT);
  pinMode(LED_2_PIN, OUTPUT);
}

void loop() {
  if (digitalRead(TOUCH_SENSOR_PIN) == HIGH) {
    blinkLed(LED_1_PIN, LED_2_PIN);
  } else {
    blinkLed(LED_2_PIN, LED_1_PIN);
  }
}

void blinkLed(int blinkingLed, int otherLed) {
  digitalWrite(otherLed, LOW);

  digitalWrite(blinkingLed, HIGH);
  delay(500);
  digitalWrite(blinkingLed, LOW);
  delay(500);
}