refactor: RootPrecision

[alxkm]

Class cleanup.
Readability improvements.
Added tests.

• 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 47.30%. Comparing base (69e1fe9) to head (276cd10).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #5383   +/-   ##
=========================================
  Coverage     47.29%   47.30%           
+ Complexity     2918     2917    -1     
=========================================
  Files           525      524    -1     
  Lines         15335    15324   -11     
  Branches       2907     2907           
=========================================
- Hits           7253     7249    -4     
+ Misses         7782     7773    -9     
- Partials        300      302    +2     

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