// Function Definition
void blinkLED(int pin, int delayTime) {
  digitalWrite(pin, HIGH); // Turn LED on
  delay(delayTime);        // Wait
  digitalWrite(pin, LOW);  // Turn LED off
  delay(delayTime);        // Wait
}

void setup() {
  pinMode(13, OUTPUT); // Set pin 13 as output
}

void loop() {
  // Function Calling
  blinkLED(13, 500); // Blink the LED every 500 ms
}