Not using unsafe

[shamaton]

Similar shamaton/msgpack#27

[codecov]

Codecov Report

Merging #8 (0be98ea) into main (fb29e84) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main       #8      +/-   ##
==========================================
+ Coverage   95.75%   95.80%   +0.05%     
==========================================
  Files          50       50              
  Lines        2002     2028      +26     
==========================================
+ Hits         1917     1943      +26     
  Misses         48       48              
  Partials       37       37              

Impacted Files	Coverage Δ
internal/generator/structure/structure.go	97.38% <100.00%> (+0.43%)	⬆️
msgpack/dec/string.go	100.00% <100.00%> (ø)

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