Efik worked on the Orange-OpenSource/hurl repository, where they implemented header argument validation for curl commands in the hurlfmt tool. Using Rust, Efik enhanced the command-line interface by introducing stricter parsing logic to enforce correct header formatting, requiring a colon between name and value or a semicolon for empty values. They developed comprehensive tests to cover both valid and invalid header formats, leveraging their skills in parsing and testing to ensure robustness. This work reduced runtime errors by rejecting malformed headers at parse time, improving the reliability of the CLI and decreasing support overhead for users of the project.