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adding file IO exericses
Once approved and merged this should close #482
Sorry, for being a tad bit late to open this PR, December was finals month so super busy.
I know this implementation isn't quite ready to be merged just yet. Looking for pointers on improving this to make it merge-worthy.
@frroossst I'm really forward to these. I hope they progressively get hard so people like me can enforce the concepts. I constantly have to look up reading multiple lines from standard input because I get it wrong for some reason each time.