code polish

[loongs-zhang]

// Describe your PR here; eg. Fixes #issueNo

Make sure that:

• You submit test cases (unit or integration tests) that back your changes.
• Your local test passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.40%. Comparing base (4e3857a) to head (a09e2c1).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #385      +/-   ##
==========================================
+ Coverage   75.12%   77.40%   +2.28%     
==========================================
  Files          72       45      -27     
  Lines        5443     5148     -295     
==========================================
- Hits         4089     3985     -104     
+ Misses       1354     1163     -191     

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