public void SaveInventory() {
        string inventoryString = "";
        for (int i = 0; i < inventory.list.Count; i++)
        {
            inventoryString += (i == 0 ? "" : "#") + inventory.list[i].itemID+"*"+inventory.list[i].stackAmount;
        }
        Debug.Log(inventoryString);
        PlayerPrefs.SetString("inv", inventoryString);
    }

    public void LoadInventory() {
        if (!PlayerPrefs.HasKey("inv"))  return;
        string inventoryString = PlayerPrefs.GetString("inv");
        var inventoryLines = inventoryString.Split('#');
        for (int i = 0; i < inventoryLines.Length; i++)
        {
            var inventoryLinesInfo = inventoryLines[i].Split('*');
            if(i < inventory.list.Count) {
                inventory.list[i].itemID = inventoryLinesInfo[0];
                int stackAmount = -1;
                int.TryParse(inventoryLinesInfo[1], out stackAmount);
                if (stackAmount > 0)
                {
                    inventory.list[i].itemID = inventoryLinesInfo[0];
                    inventory.list[i].stackAmount = stackAmount;
                } else {
                    inventory.list[i].DoEmpty();
                }
            }
        }
        inventory.UpdatedInventory.Invoke();
    }