Delete unused code

[yunfan123]

Some code is useless

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.19%. Comparing base (4250a05) to head (56c3db4).
Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
- Coverage   74.79%   74.19%   -0.61%     
==========================================
  Files          21       22       +1     
  Lines        2436     2627     +191     
  Branches      667      716      +49     
==========================================
+ Hits         1822     1949     +127     
- Misses        297      414     +117     
+ Partials      317      264      -53     

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