small refactor and typo

[Ipuch]

This change is 

[codeclimate]

Code Climate has analyzed commit dd0cb46 and detected 0 issues on this pull request.

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[codecov]

Codecov Report

Attention: Patch coverage is 15.90909% with 37 lines in your changes are missing coverage. Please review.

Project coverage is 83.80%. Comparing base (945bf3d) to head (dd0cb46).
Report is 2 commits behind head on main.

Files	Patch %	Lines
bionc/bionc_numpy/generalized_force.py	11.90%	37 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #139      +/-   ##
==========================================
- Coverage   83.84%   83.80%   -0.05%     
==========================================
  Files          93       93              
  Lines        5968     5976       +8     
==========================================
+ Hits         5004     5008       +4     
- Misses        964      968       +4     

Flag	Coverage Δ
unittests	83.80% <15.90%> (-0.05%)	⬇️

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