int ledPin = 8;
int buttonPin = 7;
bool ledState = false;
bool lastbuttonstate = HIGH;
int buttonstate = HIGH;
void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);
}

void loop() {
  int buttonState = digitalRead(buttonPin);
  
  if (buttonState == LOW && lastbuttonstate == HIGH) {
    ledState = !ledState;
    digitalWrite(ledPin, ledState);
    delay(50);
  }
  lastbuttonstate = buttonstate;
}