Worked on the espressif/qemu repository to improve codebase organization and maintainability for Windows utilities. Focused on refactoring by relocating the qemu_ftruncate64 function from block/file-win32.c to util/oslib-win32.c, centralizing Windows-specific utilities for better cross-module reuse and easier long-term maintenance. The approach emphasized minimizing surface area changes to preserve existing behavior and reduce the risk of regressions. Utilized C programming and system programming skills to ensure the refactor aligned with project standards, including thorough code review and compliance with contribution protocols. The work enhanced the structure of the Windows code path, supporting faster onboarding and future development efficiency.