add barcodeProcessor class
rename barcode to Barcode
delete cart cl
delete Barcode class
delete CartItem class
delete Item class
add Barcode class
add Cart class
add CartItem class
add Item class
add package to app
update absolute to relative path
add public before arguments
getNumber success
delete useless code
add processSplitedBarcode
add processBarcode
add all calculatePromotion functions
finish getSubTotal function
delete Cart class