int led = 13;
int button = 3;

int ledState = LOW;
int lastButtonState = HIGH;

void setup() {
  pinMode(led, OUTPUT);
  pinMode(button, INPUT_PULLUP);
}

void loop() {
  int buttonState = digitalRead(button);

  if (lastButtonState == HIGH && buttonState == LOW) {
    ledState = !ledState;
    digitalWrite(led, ledState);
    delay(200);
  }

  lastButtonState = buttonState;
}