use filepath.Join for file paths

[justsmth]

Description of changes:

To accommodate Windows use filepath.Join.

Call-outs:

Documentation:

Join joins any number of path elements into a single path, separating them with an OS specific Separator. Empty elements are ignored. The result is Cleaned. However, if the argument list is empty or all its elements are empty, Join returns an empty string. On Windows, the result will only be a UNC path if the first non-empty element is a UNC path.

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.47%. Comparing base (2835116) to head (6286f29).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1875      +/-   ##
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- Coverage   78.47%   78.47%   -0.01%     
==========================================
  Files         585      585              
  Lines       99511    99511              
  Branches    14249    14246       -3     
==========================================
- Hits        78094    78090       -4     
- Misses      20781    20782       +1     
- Partials      636      639       +3     

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