help with coin op Project

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so i had a go at trying to work this out but still no joy am i anyway right

const int coinMecPin = 2; //the number of the coin mec pin
const int relayPin = 7; //the number of the relay pin

int buttonState = LOW; // variable for reading the buttonstate


void setup() {
  // put your setup code here, to run once:
pinMode(relayPin, OUTPUT);
pinMode (coinMecPin, INPUT);
}

void loop() {

 buttonState = digitalRead(coinMecPin); // read the state of the pushbutton value:
 
// Get current "time"
   unsigned long now = millis();

   // Is it time to decrement the time remaining?
   if(now - lastDecrement > oneSecond)
   {
      lastDecrement = now;
      timeRemaining--;
   }

   // Did a coin get dumped in?
   if(gotCoin());
      timeRemaining += 1000UL * 10 * 60; // Add 10 minutes

   if(timeRemaining == 0 && deviceIsOn)
      turnDeviceOff();

   if(timeRemaining > 0 && !deviceIsOn)
      turnDeviceOn();

  void gotCoin() {
    if (buttonState == LOW);
    digitalWrite (relayPin, HIGH);
    
        
  }
}