Worked on the erlang/otp repository to address a critical issue in environment variable management, specifically improving how PATH is handled during process startup. Using C and shell scripting, implemented a fix in erlexec.c to prevent PATH truncation when ROOTDIR is missing from the initial environment, ensuring robust buffer management and correct directory concatenation. Developed a dedicated regression test to validate the new behavior and safeguard against future regressions. This work enhanced system programming reliability and increased test coverage for environment handling, focusing on stability and maintainability. The contribution centered on bug resolution rather than feature development during the period.