Env util test

[coder137]

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[codecov]

Codecov Report

Merging #107 (c99f996) into main (b702b03) will increase coverage by 0.68%.
The diff coverage is 94.74%.

@@            Coverage Diff             @@
##             main     #107      +/-   ##
==========================================
+ Coverage   74.97%   75.65%   +0.68%     
==========================================
  Files          25       25              
  Lines         727      731       +4     
  Branches      230      233       +3     
==========================================
+ Hits          545      553       +8     
+ Misses         16       13       -3     
+ Partials      166      165       -1     

Impacted Files	Coverage Δ
buildcc/lib/env/include/env/util.h	69.57% <85.71%> (+27.46%)	⬆️
...ldcc/lib/target/include/target/builder_interface.h	100.00% <100.00%> (ø)

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