scraper: avoid too long filenames

[cornelk]

Closes #42

[codecov]

Codecov Report

Attention: Patch coverage is 82.50000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 50.41%. Comparing base (f7d6b4c) to head (ab3c387).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
scraper/fileutil.go	82.50%	5 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
+ Coverage   49.18%   50.41%   +1.22%     
==========================================
  Files          14       14              
  Lines        1049     1089      +40     
==========================================
+ Hits          516      549      +33     
- Misses        473      478       +5     
- Partials       60       62       +2     

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