Fix incorrect doctest and improve log handling in num_digits functions

[ABHIRANJAN-KUMAR1]

Describe your change:

• [x] Add an algorithm?
• [ ] Fix a bug or typo in an existing algorithm?
• [ ] Add or change doctests? -- Note: Please avoid changing both code and tests in a single pull request.
• [ ] Documentation change?

Checklist:

• [x] 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.
• [x] 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 include at least one URL that points to Wikipedia or another similar explanation.
• [ ] If this pull request resolves one or more open issues then the description above includes the issue number(s) with a closing keyword: "Fixes #ISSUE-NUMBER".

[ABHIRANJAN-KUMAR1]

Hi maintainers 👋 I’ve fixed incorrect doctests and improved log handling in the num_digits function. All checks have passed successfully ✅ Kindly review and approve this PR. Thank you! 🙏

[ABHIRANJAN-KUMAR1]

Hi maintainers 👋 I’ve fixed incorrect doctests and improved log handling in the num_digits function. All checks have passed successfully ✅ Kindly review and approve this PR. Thank you! 🙏