Worked on enhancing simulator robustness in the apache/nuttx repository by addressing a critical memory handling issue. Focused on low-level programming and memory manipulation in C, the developer replaced a manual register state copy loop with the standard memmove function to ensure safe copying even when memory regions overlap. This change eliminated undefined behavior in the sim_copyfullstate routine, improving the reliability and reproducibility of simulation tests. By adopting a standard library approach, the work reduced the risk of subtle memory corruption and improved maintainability in system simulation workflows, supporting more stable development and verification processes for future contributions.