Only deal with file contents

[Baptouuuu]

This simplifies the types of objects and avoid problems when trying to rename files on the fly. Now users must explicitly define the name of the generated files

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.27%. Comparing base (ae1547d) to head (4758a53).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop      #10      +/-   ##
=============================================
- Coverage      99.36%   99.27%   -0.09%     
+ Complexity        67       54      -13     
=============================================
  Files             11       11              
  Lines            630      553      -77     
=============================================
- Hits             626      549      -77     
  Misses             4        4              

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