* Added solution to Euler 64.
Added Python solution to Project Euler Problem 64.
Added a folder problem_064.
Added __init__.py file.
Added sol1.py file.
* Update sol1.py
Made formatting changes as mentioned by pre-commit
* Update sol1.py
Minor changes to variable naming and function calling as mentioned by @ruppysuppy
* Update sol1.py
Changes to function call as mentioned by @cclauss
