ENH: Add algo665 (Sourcery refactored)

[sourcery-ai]

Pull Request #25 refactored by Sourcery.

If you're happy with these changes, merge this Pull Request using the Squash and merge strategy.

NOTE: As code is pushed to the original Pull Request, Sourcery will
re-run and update (force-push) this Pull Request with new refactorings as
necessary. If Sourcery finds no refactorings at any point, this Pull Request
will be closed automatically.

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To manually merge these changes, make sure you're on the mainRefac branch, then run:

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[sourcery-ai]

Function main refactored with the following changes:

• Merge duplicate blocks in conditional (merge-duplicate-blocks)
• Remove redundant conditional (remove-redundant-if)
• Replace multiple comparisons of same variable with in operator (merge-comparisons)