Changing Name of file and adding doctests in file. (#9513)

* Adding doctests and changing file name

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* Update binary_multiplication.py

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* Update binary_multiplication.py

* Changing comment and changing name function

* Changing comment and changing name function

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* Update binary_multiplication.py

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* Update binary_multiplication.py

* Update binary_multiplication.py

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Tianyi Zheng <[email protected]>