Coding style improvements for project_euler problem 45 & 16 (#3087)

* improvements for project euler task 45

* fixed documentation

* update pe_16/sol1.py

* update pe_16/sol2.py

* revert solution changes for sol1

* revert solution changes for sol2

* remove trailing spaces in sol1

* Update sol1.py

Co-authored-by: Dhruv <dhruvmanila@gmail.com>