Cormac Relf developed a unified unarchiving solution for the facebook/buck2-prelude repository, centralizing the logic previously split between extract_archive and http_archive. By refactoring the build system in Starlark, Cormac enabled both features to share robust, mature unarchiving code, reducing duplication and improving maintainability. The work introduced new configuration options such as strip_prefix and dictionary-based sub_targets, allowing for more flexible archive handling. Additionally, Cormac extended support to Windows, enhancing cross-platform reliability. This focused engineering effort laid a solid foundation for future archiving enhancements and streamlined the codebase, demonstrating depth in build system development and cross-platform engineering.