private void OnTriggerEnter2D(Collider2D collision)
{
if (collision.tag == "food")
{
string itemId = collision.gameObject.GetComponent <Item>().id;
// add to bag
im.AddItem(itemId); // add 1 item to bag
im.DisplayBag();
// destory it for current phase
Destroy(collision.gameObject);
}
}