refactor: HammingDistance

[alxkm]

Class cleanup.
Readability improvements.

• 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 48.85%. Comparing base (d810a1d) to head (2f6aed6).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #5404   +/-   ##
=========================================
  Coverage     48.84%   48.85%           
- Complexity     3036     3037    +1     
=========================================
  Files           524      524           
  Lines         15255    15256    +1     
  Branches       2899     2900    +1     
=========================================
+ Hits           7452     7453    +1     
  Misses         7494     7494           
  Partials        309      309           

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