Jiaqi Zhang enhanced the dealii/dealii codebase by addressing a critical bug in the interpolation handling for discontinuous Galerkin (DG) finite elements. Focusing on C++ development and finite element method infrastructure, Jiaqi corrected AssertThrow logic to ensure proper management of interpolation matrices when elements have no degrees of freedom on faces, particularly for DGQ and FE_Nothing source elements. This targeted fix improved the correctness and stability of DG interpolation pathways, reducing runtime errors in edge cases. The work demonstrated careful attention to code quality, with explicit checks and clarified logic that contribute to more maintainable and robust software engineering practices.