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Exam Coding Challenge
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|    _  ||       || |_|   ||   | ||  |   _   ||  _____|      |       ||   _   ||       |
|   |_| ||       ||       ||   |_||_ |  | |  || |_____       |       ||  | |  ||       |
|    ___||      _||  _   | |    __  ||  |_|  ||_____  | ___  |      _||  |_|  ||       |
|   |    |     |_ | |_|   ||   |  | ||       | _____| ||   | |     |_ |       || ||_|| |
|___|    |_______||_______||___|  |_||_______||_______||___| |_______||_______||_|   |_|

PROBLEM DESCRIPTION
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You have been hired to write a backend system for producing invoices for customers of an online hardware vendor.  Your
software accepts two text files, both exported from the website database, and must print an invoice for each customer.


INPUT SPECIFICATION
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partslist.txt contains a parts list with SKU numbers, produce name, and prices.
orders.txt contains a list of customers with their orders, specificed by SKU number.


OUTPUT SPECIFICATION
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Your software will generate an invoice file for each customer.  See the sample invoice files for exact content and formatting
requirements.