longest_palindrome

[Farhan-labib]

Describe your change:

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

Checklist:

• [✔️] 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.
• [ ✔️] 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.
• [x] All new algorithms include at least one URL that points to Wikipedia or another similar explanation.
• [x] 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".

[Farhan-labib]

@imSanko

Enhanced Test Cases: Added additional test cases, including complex and large strings, to thoroughly evaluate the function's performance and accuracy.

Benchmarking: Incorporated benchmarking to measure the execution time for each test case. This helps in understanding the performance of the function with different inputs.