Worked on the eclipse-zenoh/zenoh-pico repository to improve build stability and code maintainability by addressing a compiler error related to unused variables when the Z_FEATURE_QUERY feature flag was disabled. Applied disciplined use of feature flags in C to ensure that code paths were properly guarded, preventing compile-time issues and supporting smoother release cycles. Focused on debugging and code cleanliness, the patch removed a build blocker and contributed to a more reliable development process. The work included submitting a signed-off patch with a clear commit message, aligning with best practices for traceability and code quality in collaborative C programming environments.