bool led = 0;

void setup() {
  pinMode(13, OUTPUT);
  pinMode(2, INPUT);
}

void loop() {

  if (digitalRead(2) == 1) {
    delay(50); 
    
    if (digitalRead(2) == 1) { 
      led = !led;         
      digitalWrite(13, led);
      while (digitalRead(2) == 1) {
      }
      delay(50); 
    }
  }
}