Worked on enhancing device enumeration robustness in the yuwata/systemd repository, focusing on improving reliability during dynamic hardware changes. Addressed a bug where transient device presence could cause enumeration failures, particularly in hot-plug or concurrent device scenarios. Refactored the enumeration logic in C to uniformly handle transient errors by consolidating error handling paths and replacing device-specific checks with a more general approach. This change reduced the risk of aborting enumeration due to expected races, leading to smoother operation. Emphasized error handling and system programming best practices, resulting in more maintainable, readable, and testable code for future development and maintenance.