if(b->location->commodity != NULL){


trader *s = malloc(sizeof(trader));
s->store = b->location;
s->distance = i;

int index = search_items(commodity_list, b->location->commodity->name);

if(index == -1){ //this is a new commodity, not found in commodity list

item *it = malloc(sizeof(item)); //create a new commodity in list
v_init(&it->sellers);
v_init(&it->buyers);
it->name = b->location->commodity->name;

if(b->location->type == LOCATION_SELLER){
v_add(&it->sellers, s); //add buyer/seller to list of patrons in said commodity
} else {
v_add(&it->buyers, s);
}

v_add(commodity_list,it); // add commodity to list of commodities

} else { //add seller/buyer to existing item in the commodity list

item *it = ((item *) v_get(commodity_list, index));

if(b->location->type == LOCATION_SELLER){
    v_add(&it->sellers, s);
} else {
        v_add(&it->buyers, s);
        }
    }
}