Reduce and consolidate unsafe code

[OliveIsAWord]

[codecov-commenter]

Codecov Report

Merging #44 (080c712) into main (f183959) will decrease coverage by 0.00%. The diff coverage is 87.50%.

@@            Coverage Diff             @@
##             main      #44      +/-   ##
==========================================
- Coverage   96.33%   96.33%   -0.01%     
==========================================
  Files           7        7              
  Lines         873      872       -1     
==========================================
- Hits          841      840       -1     
  Misses         32       32              

Impacted Files	Coverage Δ
src/arc_str.rs	92.21% <87.50%> (-0.04%)	:arrow_down:

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