public IShipment Start(string shipmentStr)
{
var shipment = _shipmentHandler.CreateShipment(shipmentStr);
// Case where invalid input was provided, this will stop the program and will be outputed - Ignored
if (shipment == null)
{
return(null);
}
var initialShipmentPrice = shipment.Price ?? throw new ArgumentNullException("Price is null.");
_rulesHandler.ApplyRules(shipment);
_discountHandler.StartDiscountFunctions(shipment, initialShipmentPrice);
return(shipment);
}
