Ranxin Lin focused on improving the reliability and safety of the deepmodeling/abacus-develop repository by addressing input validation and memory management issues in C++. During the month, Ranxin enhanced the Fcoef::create function to enforce positive parameter checks and provide detailed error feedback, reducing the risk of invalid inputs causing runtime failures. To further strengthen memory safety, Ranxin replaced a fixed-size character array with std::string in input.cpp, mitigating buffer overflow risks. These targeted changes, rooted in strong debugging and error handling practices, contributed to more robust API behavior and improved diagnostics, reflecting a thoughtful approach to code stability and maintainability.