Cleanup Project Euler Problem 01

[drts01]

Describe your change:

• clean up docstrs
• add type hints
• improve coding-style
   
• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Documentation change?

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new Python files are placed inside an existing directory.
• All filenames are in all lowercase characters with no spaces or dashes.
• All functions and variable names follow Python naming conventions.
• All function parameters and return values are annotated with Python type hints.
• All functions have doctests that pass the automated testing.
• All new algorithms have a URL in its comments that points to Wikipedia or other similar explanation.
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

Part of Issues: #2786, #2510

[dhruvmanila]

Due to #2891, this becomes unnecessary. Thanks for your contribution!

[drts01]

@dhruvmanila the type hints was just one commit. the code clean up in the other 4 commits are not desired? FYI, I dropped the type hints commit and rebased off of master if you want reopen and merge these change.

[dhruvmanila]

Sure thing, remove the type hints commit and it will be good to go.
Also, why are you disabling flake8?

I cannot reopen as you rebased it.

[drts01]

will create a new PR. that noqa was a mistake 🤦