Help me with this code

Code:

void function(int a, int b, int c) {
   char buffer1[5];
   char buffer2[10];
   int *ret;

   ret = buffer1 + 12;
   (*ret) += 8;
}

void main() {
  int x;

  x = 0;
  function(1,2,3);
  x = 1;
  printf("%d\n",x);
}

I found this code on smashing the stack tutorial and the code given here is expected to jump"x=1;" assignment statement but the code is not working as desired... anyone please help in explaining and correcting this buffer overflow sample code.