During March 2026, contributed to the eugenp/tutorials repository by developing enhanced data structure utilities focused on managing ArrayList values within Java HashMaps. This work introduced new methods that streamline the manipulation of composite data structures, aiming to improve both code maintainability and onboarding for future contributors. The implementation leveraged Java and JUnit for comprehensive unit testing, ensuring correctness across typical and edge cases. Adhered to a disciplined Git-based workflow with clear commit messages and collaborative code reviews, emphasizing code quality and test coverage. No bugs were addressed during this period, with efforts concentrated on feature delivery and robust validation practices.