Worked on the moonbitlang/core repository to deliver targeted code modernization and improve API consistency. Focused on refactoring internal modules by removing deprecated usages, updating function calls, and aligning example syntax with current API patterns. This approach reduced technical debt and enhanced maintainability, creating a more stable foundation for future development. Utilized MoonBit and mbt languages while applying skills in API updates, core library maintenance, and documentation. The changes ensured more predictable API usage and safer onboarding for new contributors, while minimizing the risk of breaking changes. No bugs were fixed during this period, with efforts concentrated on feature and code quality improvements.