During February 2025, Guangyu Fan focused on enhancing the robustness of identifier resolution in the cloudwego/hertz repository. He addressed a critical bug affecting the handling of filenames containing dots by refactoring the resolution logic to use Go’s strings.LastIndex function, replacing the previous strings.SplitN approach. This change improved the accuracy of dependency and type extraction, reducing edge-case failures and increasing build reliability. His work centered on code refactoring and string manipulation in Go, targeting long-term maintainability. Although the period involved no new features, the targeted fix and concise refactor demonstrated careful attention to reliability and developer experience in the codebase.