public void UpdateSupplies()
{
for (int i = 0; i < Supplies.Count; i++)
{
if (Supplies[i].DateTimeEnd <= DateTime.Now)
{
HistorySupplies.Add(CopySupply(Supplies[i]));
foreach (var portion in Supplies[i].Portions)
{
portion.Item.Available += portion.Amount;
}
Supplies.RemoveAt(i);
i--;
}
}
}
