Sortable Test written in Go

To compile, run:

./run.sh

An executable will be create. On Windows, this is main.exe:

$ ./main.exe

Please provide path to listings file.
  -listings string
        path to listings file
  -output string
        path to output file
  -products string
        path to products file

If you place the products.txt and listings.txt in local folder, then you can run:

$ ./main.exe -listings listings.txt -products products.txt -output results.txt

20196 listings read.
3445 listing with unknown manufucturer.
7290 matches written.

This will create a results.txt file.