refactor command line v0.2

[Vasile-Hij]

refactor command line v0.2 to accept more functions

• issue with reading file as I have used custom function that returned list of string, but some inputs create more overhead rather than simplify process of solving the day;
• now input file it will be as simple as read file, but other functions will process the input it will be printed: as raw and as processed fastening the time to focus to solution;
• also, main.py need to be refactored to support new implementation.