refactor: Enhance docs, add more tests in `SingleBitOperations`

[Hardvan]

• [x] I have read CONTRIBUTING.md.
• [x] This pull request is all my own work -- I have not plagiarized it.
• [x] All filenames are in PascalCase.
• [x] All functions and variable names follow Java naming conventions.
• [x] All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• [x] 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 :white_check_mark:

Project coverage is 70.30%. Comparing base (647a82a) to head (24a4776).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #5860   +/-   ##
=========================================
  Coverage     70.29%   70.30%           
- Complexity     4764     4765    +1     
=========================================
  Files           635      635           
  Lines         17307    17307           
  Branches       3331     3331           
=========================================
+ Hits          12166    12167    +1     
  Misses         4680     4680           
+ Partials        461      460    -1     

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