Worked on the zsh-users/zsh repository to enhance the reliability of interactive shell components by addressing a critical bug in the SelectList feature. Focused on hardening string handling within the selectlist function in loop.c, the developer identified and fixed an issue with destructive unmetafy, which previously risked string corruption and memory errors. Using C programming and system-level debugging skills, the solution improved code safety and aligned with upstream stability objectives. The work demonstrated careful memory management and precise change tracking, ensuring safer string operations for end users and contributing to the long-term maintainability of the zsh codebase.