refactor: Enhance docs, add tests in KahnsAlgorithm

[Hardvan]

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.68%. Comparing base (3a9a2c4) to head (124081a).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5965      +/-   ##
============================================
+ Coverage     67.45%   67.68%   +0.23%     
+ Complexity     4578     4577       -1     
============================================
  Files           620      620              
  Lines         17147    17145       -2     
  Branches       3310     3311       +1     
============================================
+ Hits          11566    11605      +39     
+ Misses         5137     5094      -43     
- Partials        444      446       +2     

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