public string Move(IProduct a, Warehouse b, int q)
{
foreach (IProduct i in this.products)
{
if (i.SKU == a.SKU)
{
i.quantity -= q;
b.Adding(a, q);
return($"{q} {i.name} was moving in quantity and there left = {i.quantity}");
}
}
return("The product was not migrate");
}