Implement STM part 8

[BowenFu]

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[codecov-commenter]

Codecov Report

Merging #43 (1bb6473) into main (45b21b2) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
- Coverage   72.12%   72.08%   -0.05%     
==========================================
  Files           1        1              
  Lines         940      942       +2     
  Branches      261      263       +2     
==========================================
+ Hits          678      679       +1     
+ Misses         31       28       -3     
- Partials      231      235       +4     

Impacted Files	Coverage Δ
include/hspp.h	72.08% <100.00%> (-0.05%)	⬇️

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