refactor: install Fallow code analysis tool & apply some suggestions

[ghiscoding]

https://docs.fallow.tools/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (9346fcd) to head (6cb8a33).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2594   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files         197      198    +1     
  Lines       25355    25312   -43     
  Branches     8961     8961           
=======================================
- Hits        25355    25312   -43     

Flag	Coverage Δ
angular	100.0% <ø> (ø)
universal	100.0% <100.0%> (ø)

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commit: 6cb8a33