Worked on internal optimization of the python/cpython repository, focusing on reducing the memory footprint of PyCodeObject structures. Addressed memory management by conditionally declaring the _co_unique_id field only when Free Threading is enabled, utilizing the _PyCode_DEF_UNIQUE_ID macro to achieve this selective allocation. This approach aligned with broader repository efforts to improve memory efficiency in the Python core, ensuring that unnecessary memory is not consumed in builds where Free Threading is disabled. The work demonstrated careful integration with the C-API and macro usage, leveraging skills in C, systems programming, and memory management to deliver targeted, maintainable improvements.