Worked on the arcsysu/YatCC repository to enhance developer tooling and repository hygiene over a focused one-month period. Enabled inspection of STL containers during debugging by updating the launch.json configuration, streamlining the process of analyzing complex C++ data structures at runtime. Improved documentation accuracy by correcting the ANTLR grammar file reference in the README, reducing confusion for new contributors. Addressed repository cleanliness by adding .DS_Store to the .gitignore and removing tracked instances, supporting a more maintainable codebase. Leveraged skills in Git, IDE configuration, and debugging to deliver targeted improvements that facilitate smoother development and onboarding for future contributors.