fix: non constant expression in array size

[kostasrim]

Expression of the form int arr[SOME_NON_CONSTANT] are illegal by the C++ standard yet compilers support it as an extension. Let's not use that and use vector instead. On the bonus side we also now don't have a warning.

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.91%. Comparing base (d30de86) to head (2eae231).
Report is 138 commits behind head on master.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #368      +/-   ##
==========================================
+ Coverage   77.60%   77.91%   +0.30%     
==========================================
  Files         103      108       +5     
  Lines        7824     8950    +1126     
==========================================
+ Hits         6072     6973     +901     
- Misses       1752     1977     +225     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.