delete useless codes

[ghost]

Sider has detected 1 warning on analyzing the commit fc48008.

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[codecov[bot]]

Codecov Report

Merging #146 (fc48008) into dev (d759b97) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #146   +/-   ##
=======================================
  Coverage   41.50%   41.50%           
=======================================
  Files          24       24           
  Lines        1959     1959           
=======================================
  Hits          813      813           
  Misses        900      900           
  Partials      246      246           

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