visitor.py LOC cleanup

[micpap25]

Summary of changes

Start on #188
First commit fixes some typos and starts a validation function; long-term goal is to aggregate more of the validation process into helper functions.

Still needs tests!

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[github-actions]

👋 Hey there! It looks like the changelog might need an update.

Please take a moment to edit the CHANGELOG.md with:

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[TheGupta2012]

Thanks @micpap25 for working on this! Can you please resolve the comments and continue the work for refactoring the visitor? This seems like a good start!