diff --git a/src/main/c/Stefan/blackjack.c b/src/main/c/Stefan/blackjack.c
index 9c40be9..4af7f15 100644
--- a/src/main/c/Stefan/blackjack.c
+++ b/src/main/c/Stefan/blackjack.c
@@ -8,14 +8,20 @@ int blackjack(){
 
     printf("Welcome to Blackjack \n\n");
 
+    bool exit = false;
+    bool *exitPtr = &exit;
     int balance = getBalanceBJ();
 
     while(balance > 0){
         printf("Aktuelles Guthaben: %d\n", balance);
-        int bet = getBetBJ(balance);
+        int bet = getBetBJ(balance, exitPtr);
+        if(exit) {
+            return -1;
+        }
+
         balance -= bet;
 
-        playBJ(bet, balance);
+        balance = playBJ(bet, balance);
     }
 
     return 0;
@@ -24,18 +30,21 @@ int blackjack(){
 int getBalanceBJ(){
     printf("Guthaben einwerfen: ");
     int balance = userInputBJ();
-    printf("Dein Guthaben: %d\n", balance);
     return balance;
 }
 
-int getBetBJ(int balance){
+int getBetBJ(int balance, bool *exitPtr){
 
     while(1){
+        printf("\nGib (0) ein, um Blackjack zu verlassen.\n");
         printf("Wetteinsatz: ");
         int bet = userInputBJ();
 
         if(bet <= balance && bet > 0){
             return bet;
+        } else if(bet == 0) {
+            *exitPtr = true;
+            break;
         } else {
             printf("Ungueltige Eingabe!\n");
         }
diff --git a/src/main/c/Stefan/blackjack.h b/src/main/c/Stefan/blackjack.h
index adc9a15..5b2bc79 100644
--- a/src/main/c/Stefan/blackjack.h
+++ b/src/main/c/Stefan/blackjack.h
@@ -5,7 +5,7 @@
 
 int blackjack();
 int getBalanceBJ();
-int getBetBJ(int balance);
+int getBetBJ(int balance, bool *exitPtr);
 int userInputBJ();
 int getRandCard();
 int playBJ(int bet, int balance);
diff --git a/src/test/c/Stefan/test_blackjack.c b/src/test/c/Stefan/test_blackjack.c
index 25d5957..a31db25 100644
--- a/src/test/c/Stefan/test_blackjack.c
+++ b/src/test/c/Stefan/test_blackjack.c
@@ -102,6 +102,20 @@ void test_cards_ace_10_total_equals_21() {
 
 }
 
+void test_cards_ace_ace_9_total_equals_21() {
+
+    //arrange
+    int userCards[] = { 11, 11, 9};
+    int expected_result = 21;
+
+    //act
+    int actual_result = calculateCardsTotal(userCards, 3);
+
+    //assert
+    TEST_ASSERT_EQUAL_INT(expected_result, actual_result);
+
+}
+
 void test_blackjack_bet_equals_10() {
 
     //arrange