refactor: Enhance docs, code, add tests in MinimaxAlgorithm

[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 76.91%. Comparing base (b5246c3) to head (fcef104).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #6641   +/-   ##
=========================================
  Coverage     76.90%   76.91%           
- Complexity     6069     6072    +3     
=========================================
  Files           719      719           
  Lines         20397    20398    +1     
  Branches       3951     3951           
=========================================
+ Hits          15687    15689    +2     
  Misses         4114     4114           
+ Partials        596      595    -1     

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