Worked on the deepmodeling/abacus-develop repository to optimize the module_pw component, focusing on improving complex buffer copying for enhanced performance and maintainability. Applied C++ and parallel programming techniques to streamline data transformations, while introducing comprehensive round-trip unit tests to ensure data integrity across complex operations. The approach emphasized cleaner code and robust testing, removing outdated SIMD benchmarks and documentation to simplify ongoing maintenance. Implementation aligned with modern C++ standards, including the use of std::copy_n and the removal of legacy compiler pragmas. These efforts established a foundation for safer production deployments and accelerated future enhancements within the codebase.