Update two_sum.py

[Tithi234]

Describe your change:

• Handles zero input cases correctly for LCM
• Ensures LCM results are always non-negative
• Improves correctness without changing existing algorithm structure

What type of change is this?

• Fix a bug or typo in an existing algorithm?

Checklist:

• I have read CONTRIBUTING.md
• This pull request is all my own work
• I know that pull requests will not be merged if they fail the automated tests
• This PR only changes one algorithm file
• 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

[Tithi234]

Acknowledged the failing CI checks.

I’m reviewing the issues carefully and will update this PR
with a clean fix once everything is resolved.
Thanks for your patience.

[mindaugl]

No changes