Fix main function

[danlooo]

Currently, calling the main function will not produce any file. One output path still contains the year variable. julia_main() will also not produce any file. Furthermore, the testitem did not test anything.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.85%. Comparing base (3311adf) to head (b3e6575).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #91       +/-   ##
===========================================
+ Coverage   21.51%   46.85%   +25.33%     
===========================================
  Files           7        7               
  Lines         316      318        +2     
===========================================
+ Hits           68      149       +81     
+ Misses        248      169       -79     

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