During November 2024, Hayato refactored the entrypoint error messaging logic in the 42-pong/42-pong repository, focusing on improving code readability and maintainability without altering functionality. By updating entrypoint.sh to use Python f-strings and enhancing shell script clarity, Hayato streamlined error reporting, which helps reduce debugging time and supports faster onboarding for new contributors. The work demonstrated disciplined backend development and scripting skills, emphasizing clean commit practices and code-quality refinement. Although no major bugs were addressed, the targeted improvements to error message formatting contributed to a more maintainable codebase and preserved release stability, reflecting a thoughtful, quality-driven engineering approach.