public Deck() {
        cards = new Card[52];
        int i = 0;
        for (int suit = 0; suit < 4; suit++){
            for (int cardValue = 1; cardValue < 14; cardValue++){
                cards[i] = new Card(cardValue, suit);
                i++;
            }
        }

    }

    public Deck(Deck other) {
        //the cards array is a private variable. so u cant access length or a particular card directly. thats why we have written getters for it.
        //use that to find length and access a card
        cards = new Card[other.cards.length];
        for (int i = 0; i < other.cards.length; i++){
            cards[i] = other.cards[i];
        }
    }