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Description of Change
Adding test for istream operator. Additionally also changes the input.txt for ostream and istream to have all the input cases separated by comma. Having each input on new line was causing file read to pick up the '\r' character as well. And as of now largeInt cannot handle invalid strings as input to constructor. So to avoid additional string manipulation, I have using comma as a delimited for inputs.
Also changed file(COPY) to just copy input.txt file without creating input.txt directory.
Checklist
Notes: Fixes #54 and #1