player gets way to many cards and I dont know why pls help

backend/requests/blackjack.http

@@ -5,3 +5,8 @@ Content-Type: application/json
 {
   "betAmount": 1.01
 }
+
+###
+POST http://localhost:8080/blackjack/52/hit
+Authorization: Bearer {{token}}
+

backend/src/main/java/de/szut/casino/blackjack/BlackJackGameController.java

@@ -11,6 +11,7 @@ import org.springframework.web.bind.annotation.*;
 import java.math.BigDecimal;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Optional;
 
 @Slf4j
@@ -35,11 +36,14 @@ public class BlackJackGameController {
 
         UserEntity user = optionalUser.get();
         BlackJackGameEntity game = blackJackService.getBlackJackGame(id);
-        if (game == null) {
+        if (game == null || !Objects.equals(game.getUserId(), user.getId())) {
             return ResponseEntity.notFound().build();
         }
 
-        
+        // TODO validate that hit is a valid action
+
+        blackJackService.hit(game);
+        return ResponseEntity.ok(game);
     }
 
     @PostMapping("/blackjack/start")

backend/src/main/java/de/szut/casino/blackjack/BlackJackService.java

@@ -5,6 +5,8 @@ import de.szut.casino.user.UserRepository;
 import org.springframework.stereotype.Service;
 
 import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Optional;
 import java.util.Random;
 
@@ -48,6 +50,15 @@ public class BlackJackService {
         return game;
     }
 
+    public BlackJackGameEntity hit(BlackJackGameEntity game) {
+        CardEntity drawnCard = drawCardFromDeck(game);
+        List<CardEntity> playerCards = game.getPlayerCards();
+
+        playerCards.add(drawnCard);
+        blackJackGameRepository.save(game);
+        return game;
+    }
+
     private void initializeDeck(BlackJackGameEntity game) {
         for (Suit suit : Suit.values()) {
             for (Rank rank : Rank.values()) {