Çözüldü C basit ama çalışmayan Switch Case kodu

#include <stdio.h>
#include <stdlib.h>

void menu()
{

 printf("********MENU********\n\n");
 printf("1. Kasayi Goster.\n");
 printf("2. Para Cekme.\n");
 printf("3. Para Yatirma.\n");
 printf("4. Cikis.\n");

}

int main()
{

 menu();

 int secim,bakiye;
 int b1,b2,b3,b4,b5;//b1 5tl banknot, b2 10tl banknot, b3 20 tl banknot, b4 50tl banknot, b5 100 tl banknot sayısı.
 printf("\n\n");
 printf("Seciminiz: ");
 scanf("%d",&secim);

 bakiye = 3750;
 b1= 50;
 b2= 50;
 b3= 50;
 b4= 20;
 b5= 10;

 switch(secim)
 {
 case 1:
 printf("Mevcut bakiye: %d TL\n",bakiye);
 printf("Kasanin durumu:\n");
 printf("5 TL banknot miktari: %d\n",b1);
 printf("10 TL banknot miktari: %d\n",b2);
 printf("20 TL banknot miktari; %d\n",b3);
 printf("50 TL banknot miktari: %d\n",b4);
 printf("100 TL banknot miktari: %d\n",b5);
 printf("\n\n");
 menu();

 break;
 default:printf("yanlis gisir.");break;

 }

 return 0;
}