Rewrite Stack with generics

[oinume]

No description provided.

[codecov]

Codecov Report

Merging #50 (ef15d54) into main (aea196f) will decrease coverage by 0.31%.
The diff coverage is 55.55%.

@@            Coverage Diff             @@
##             main      #50      +/-   ##
==========================================
- Coverage   76.08%   75.76%   -0.32%     
==========================================
  Files          16       16              
  Lines         552      553       +1     
==========================================
- Hits          420      419       -1     
- Misses         91       93       +2     
  Partials       41       41              

Impacted Files	Coverage Δ
datastructure/stack/stack.go	50.00% <42.85%> (-6.25%)	⬇️
datastructure/graph/finder.go	75.86% <100.00%> (-0.81%)	⬇️

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