fix: optimize paser cert chain func

[shipengqi]

No description provided.

[codecov-commenter]

Codecov Report

Merging #9 (fff261e) into main (9f9b7e9) will increase coverage by 0.38%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
+ Coverage   67.67%   68.05%   +0.38%     
==========================================
  Files          14       14              
  Lines         631      623       -8     
==========================================
- Hits          427      424       -3     
+ Misses        146      143       -3     
+ Partials       58       56       -2     

Flag	Coverage Δ
unittests	68.05% <100.00%> (+0.38%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
crtutil/crt.go	86.36% <100.00%> (+5.28%)	⬆️

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