Added HandOfCard class to

follow good practises

src/main/java/edu/ntnu/stud/cardgame/DeckOfCards.java

@@ -24,17 +24,17 @@ public class DeckOfCards {
     return deck;
   }
 
-  public Collection<PlayingCard> dealHand(int n) {
+  public HandOfCards dealHand(int n) {
     if (n < 0 || n > deck.size()) {
       throw new IllegalArgumentException("Invalid number of cards to deal");
     }
-    Collection<PlayingCard> hand = new ArrayList<>();
+    HandOfCards hand = new HandOfCards();
     for (int i = 0; i < n; i++) {
       int cardIndex = random.nextInt(deck.size());
-      if (hand.contains(deck.get(cardIndex))) {
+      if (hand.getHand().contains(deck.get(cardIndex))) {
         i--;
       } else {
-        hand.add(deck.remove(cardIndex));
+        hand.addCard(deck.get(cardIndex));
       }
     }
     return hand;