Alfredo Hernandez Baeza 47a44abe23 Improve longest_common_substring.py (#12705)
* Update longest_common_substring.py

- Combined the ans_index and ans_length into a single tuple to track the best match (position + length) more cleanly.

- Early exit for empty strings.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Update longest_common_substring.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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The Algorithms - Python

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All algorithms implemented in Python - for education

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