const int buttonPin = 2;
const int led1 = 7;

volatile int buttonstats;

// When button is pressed or released
void OnPinStatusChage()
{

  int buttonstatus = digitalRead(buttonPin);

  if (buttonstatus == LOW)
    digitalWrite(led1, HIGH);
  else
    digitalWrite(led1, LOW);

}

void setup()
{
  pinMode(buttonPin, INPUT_PULLUP); // Set the button pin as input with pull-up resistor
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);

  noInterrupts();

  // Interrupt call on pressing button
  attachInterrupt(digitalPinToInterrupt(2), OnPinStatusChage, CHANGE);

  interrupts();

}

void loop()
{

}