add sample.

[codecov-commenter]

Codecov Report

Base: 66.51% // Head: 66.39% // Decreases project coverage by -0.11% :warning:

Coverage data is based on head (a5c977d) compared to base (a545a7c). Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #115 +/- ## ========================================== - Coverage 66.51% 66.39% -0.12% ========================================== Files 4 4 Lines 1744 1744 Branches 600 602 +2 ========================================== - Hits 1160 1158 -2 - Misses 49 51 +2 Partials 535 535 ``` | [Impacted Files](https://codecov.io/gh/BowenFu/hspp/pull/115?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bowen+Fu) | Coverage Δ | | |---|---|---| | [include/hspp.h](https://codecov.io/gh/BowenFu/hspp/pull/115/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bowen+Fu#diff-aW5jbHVkZS9oc3BwLmg=) | `76.75% <0.00%> (-0.19%)` | :arrow_down: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bowen+Fu). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bowen+Fu)

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