Worked on the cs-pub-ro/operating-systems repository to enhance the robustness of file I/O operations in C, focusing on system programming challenges related to partial reads and writes. Addressed a bug where incomplete buffer processing could lead to data corruption by ensuring that all read and write operations handle partial transfers correctly. Improved the mmap_cp example by correcting a typo and implementing file size retrieval using fstat(), aligning documentation and examples with real-world usage. These changes improved reliability in production workflows and made onboarding easier for other developers, demonstrating a careful approach to C programming and low-level file management.