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typedef struct t{
    int data;
    struct t *next;
}T;
void main(){
  T* obj1 = mini_gc_malloc(sizeof(T));
  add_roots(obj1,(void*)obj1+sizeof(T));

  T* obj2 = mini_gc_malloc(sizeof(T));
   obj1->next = obj2;
   //there is not call add_roots ,beacuse obj1 is reference obj2 by pointer next

   //so let's call gc
    garbage_collect()
}

void gc_mark_range(void *start,void *end){
    for (p = start; p < end; p++) {
         //over here,  the obj1 havs no chance to mark
         gc_mark(*(void **)p);
    }
}

void add_roots(void * start, void * end){}

void
garbage_collect(void)
{
    size_t i;
    //over there
   // i didn't find anywhere to use the root_ranges and initialization
    for (i = 0; i < root_ranges_used; i++) {
        gc_mark_range(root_ranges[i].start, root_ranges[i].end);
    }
}