public void Change(IEquippable <Item> itemEquipped, IEquippable <Item> itemInBackpack, IHero hero)
{
IEquippable <Item> freeSlot;
freeSlot = itemInBackpack;
itemInBackpack = itemEquipped;
hero.Equippment[freeSlot.SlotCompatibility] = null;
hero.Equip(freeSlot);
// itemEquipped = freeSlot;
}