// constants won't change. They're used here to set pin numbers:
const int btn = 2;         // the number of the pushbutton pin
const int ledPin = 13;     // the number of the LED pin

int ledState = HIGH;       // the current state of the output pin

namespace button {
  unsigned long interval = 200;
  unsigned long buttonPressedTime = 0;
  bool buttonState = false;

  bool state(int buttonPin){
    unsigned long currentMillis = millis();
    int reading = digitalRead(buttonPin);

    if (reading == LOW && !buttonState) {
      // Button was just pressed
      buttonState = true;
      buttonPressedTime = currentMillis;
    }

    if (reading == HIGH && buttonState) {
      // Button was just released
      buttonState = false;
      interval = 200;  // Reset the interval to 200ms
    }

    return buttonState;
  }
}

void setup() {
  pinMode(btn, INPUT_PULLUP);  // Set the button pin as an input with a pull-up resistor
  Serial.begin(115200);
}

void loop(){
  Serial.print("Button State: ");
  Serial.println(button::state(btn));

  if(button::state(btn)) ledState = HIGH; 
  else ledState = LOW;

  digitalWrite(ledPin, ledState);
}