Exercise: Display scores

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Read in a file where on each line there is a name and a score  
with a comma between them. 
Print them sorted based on name.
Then also print sorted based on score.

examples/hashes/score_data.txt

Foo,23
Bar,70
Baz,92
Bozo,17
Gozo,52
Dardon,20
Mekodra,23