fix: Handle errors instead of unwrap

[Stranger6667]

Fixes #65

Closes #20

[codecov]

Codecov Report

Merging #73 into master will decrease coverage by 0.65%.
The diff coverage is 34.00%.

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
- Coverage   82.52%   81.87%   -0.66%     
==========================================
  Files          45       45              
  Lines        3204     3227      +23     
==========================================
- Hits         2644     2642       -2     
- Misses        560      585      +25     

Impacted Files	Coverage Δ
src/error.rs	59.90% <0.00%> (-5.19%)	⬇️
src/lib.rs	17.77% <ø> (+0.19%)	⬆️
src/resolver.rs	78.92% <85.71%> (+2.12%)	⬆️
src/compilation.rs	91.66% <100.00%> (-0.07%)	⬇️

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