Guo focused on targeted maintenance within the lizongying/homebrew-cask repository, addressing a critical issue in font asset delivery. Using Ruby and leveraging expertise in Homebrew Cask, Guo corrected the Zhuque Fangsong font download URL by removing an incorrect segment from the filename, ensuring alignment with the proper archive for version 0.211. This precise fix reduced user installation failures and minimized potential support overhead by stabilizing the asset delivery process. Guo’s work demonstrated careful validation of asset naming conventions, contributing to improved maintainability and reliability in font distribution workflows, though the scope was limited to a single bug fix during the period.