Worked on the uutils/coreutils repository to enhance the Echo command by focusing on both performance and reliability. Applied Rust and system programming skills to reduce memory allocations during argument processing, resulting in more efficient command execution. Expanded the test suite to cover cases with empty arguments and multiple occurrences of version and help flags, thereby lowering the risk of regressions and improving stability in typical usage scenarios. Emphasized thorough testing and memory management practices throughout the development process. The work demonstrated a methodical approach to optimizing command line tools, with careful attention to maintainability and robust validation using Rust’s testing capabilities.