Implement STM part 6

[BowenFu]

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[codecov-commenter]

Codecov Report

Merging #40 (cbda798) into main (e008f18) will not change coverage.
The diff coverage is 62.50%.

@@           Coverage Diff           @@
##             main      #40   +/-   ##
=======================================
  Coverage   71.96%   71.96%           
=======================================
  Files           1        1           
  Lines         938      938           
  Branches      261      261           
=======================================
  Hits          675      675           
  Misses         32       32           
  Partials      231      231           

Impacted Files	Coverage Δ
include/hspp.h	71.96% <62.50%> (ø)

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