refactor: `FloydTriangle`

[alxkm]

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Improving readability. Adding tests.

• [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 46.26%. Comparing base (3408977) to head (4d8320b).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5367      +/-   ##
============================================
+ Coverage     46.19%   46.26%   +0.07%     
- Complexity     2861     2865       +4     
============================================
  Files           525      525              
  Lines         15412    15410       -2     
  Branches       2916     2916              
============================================
+ Hits           7119     7129      +10     
+ Misses         7992     7981      -11     
+ Partials        301      300       -1     

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