Worked on enhancing reliability and developer experience in C-based example programs for the eclipse-zenoh/zenoh-pico and ZettaScaleLabs/zenoh-c repositories. Focused on robust error handling by updating sample code to detect and respond to negative return values from API calls, preventing silent failures and clarifying error semantics for client code. Applied defensive programming techniques in C, emphasizing error handling and API integration to ensure that example programs accurately signal and manage failures. This approach improved the consistency and reliability of example code, laying a foundation for more maintainable client implementations and reducing the risk of overlooked errors in future development.