Note:

• method testReceiptCalculator of ReceiptCalculatorIntegrationTest is used to obtain the receipt using the test cases written in input.json file

• the input that receive ReceiptCalculator must follow the pattern: 1 chocolate at 10.34 or 23 perfume at 34.34 Not allowed: box at 132 (missing qty) or 1 perfume 34.65 (missing at),or perfume at 23 in these case -1 will be returne for quantity and NaN for price of good

• settings.json: here user can define which goods are exempt by taxes and which are the tax rate applied to imported and all goods. For exempts good, user express a regular expression that good inserted in the receipt must match if it is an exempt good