- Removed header/footer print statements from main() - Added '\n' prefix to section headers (except first) for consistent spacing - Follows the pattern established in maphash and other demo files This makes the output cleaner and consistent with other demo files in the project. Generated with [codeagent](https://github.com/qbox/codeagent) Co-authored-by: luoliwoshang <51194195+luoliwoshang@users.noreply.github.com>