int main(int argc, char const *argv[]){
        int *array ;
        foo(array) ;
        /* Rest of the code */
 }

    int foo(int *array){
          // I know I am missing some *malloc not working* if's
          int *temp , j = 0 , i;
          array = malloc(sizeof(int)) ;
          if (array){
             for (i=0 ; i < 10 ; i++){
               array[j] = i*i  ;
               temp = realloc( array , (++j+1)*sizeof(int) ) ;
               if (temp != NULL ) {
                 array = temp ;
               }
             }
          }
          return j
     }