Mengliang Xia worked on the putyy/res-downloader repository, focusing on a comprehensive codebase refactor to remove unnecessary comments. By streamlining the Go backend code, Xia improved overall readability and maintainability, making it easier for new contributors to onboard and for reviewers to assess changes efficiently. The refactor involved careful commit discipline, ensuring each change was clear and atomic, and prioritized language-agnostic comment cleanup to reduce codebase noise. This work established a cleaner foundation for future feature development, aligning with best practices in Go and backend development while addressing long-term maintainability and code quality within the downloader project.