Arduino button sketch

I decided to work out arduino.
I had a problem with sticking the buttons, here is an attempt to solve the problem

const int relayPin = 7;
const int buttonPin = 2;
bool buttonpress = false;
bool stateswitch = false;


int buttonState = 0;
int lastButtonState = 0;
unsigned long buttonOnTime;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(relayPin, OUTPUT);
  pinMode(buttonPin, INPUT);
}

void loop() {

  buttonState = digitalRead(buttonPin);
  if ((buttonState == HIGH) && (millis() - buttonOnTime > 500)) {
    buttonOnTime = millis();
    if (stateswitch)
    {
      Serial.println("Button off");
    }
    else
    {
      Serial.println("Button on");
    }
    stateswitch = !stateswitch;
    //    delay(500);
  } else if ((buttonState == HIGH))
  {
    buttonOnTime = millis();
  }



  //
  //  buttonState = digitalRead(buttonPin);
  //   if ((buttonState == HIGH)) {
  //
  //    Serial.print("Button:");
  //    Serial.println(buttonState);
  //    Serial.print("Relay:");
  //    stateswitch = digitalRead(relayPin);
  //    Serial.println(stateswitch);
  //    digitalWrite(relayPin, !stateswitch);
  //
  //
  //   }
  // delay(200);
  //
  //  if (buttonState == HIGH) {
  //    //Serial.println("HIGH");
  //    digitalWrite(relayPin, HIGH);
  //  }
  //  else
  //  {
  //    //Serial.println("LOW");
  //    digitalWrite(relayPin, LOW);
  //  }
  // put your main code here, to run repeatedly:
  //  digitalWrite(relayPin, LOW);
  //  delay(5000);
  //  digitalWrite(relayPin, HIGH);
  //  delay(5000);
}