update Promotion
change PromotionType Class Name to PromotionFactory
format code
change Method Name to barcodesToBoughts
delete useless file
delete PromotionService
update App Class
delete StorageService
update Promotion Class
update DisCountPromotion Class
update SecondHalfPricePromotion Class
update code
update code
update code
update Pos Method
change Method Name
delete PosTest
barcodesToBoughtItem test
update
move boughtItem Method to BoughtItemService