During April 2025, Huichen worked on the microsoft/WindowsAppSDK repository, focusing on a targeted bug fix to improve type safety and resource data merging in the MRT component. Using C++ and leveraging strong software development and unit testing skills, Huichen addressed integer type casting and loop variable issues that previously caused type mismatches and potential runtime exceptions. The solution involved refining the core resource data merging logic and expanding unit test coverage to catch regressions early. This work enhanced the reliability and maintainability of MRT data handling, aligning the codebase with project-wide type-safety standards and improving overall build stability.