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Add sum_of_digits implementation in Python #4

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Add sum_of_digits implementation in Python #4

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@agarwalpranay02
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@agarwalpranay02 agarwalpranay02 commented Oct 28, 2025

Describe your change

  • Add an algorithm

Added an iterative implementation to compute sum of decimal digits at maths/add_digits.py.
Includes doctest examples and input validation. Beginner-friendly contribution for Hacktoberfest.

Checklist

  • I have read CONTRIBUTING.md
  • This pull request is all my own work and I have not plagiarized.
  • I know this PR will not be merged if it fails the automated tests.
  • This PR only changes one algorithm file.
  • All new Python files are placed inside an existing directory.
  • All filenames are in all lowercase with no spaces or dashes.
  • All functions and variable names follow Python naming conventions.
  • All function parameters and return values are annotated with type hints.
  • All functions have docstrings and pass automated testing.
  • Includes at least one URL reference to explanation.

Reference: https://en.wikipedia.org/wiki/Digital_root

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@agarwalpranay02