fix: handle empty inputs in CircleSort

[vil02]

This PR adds tests for CircleSort and fixes the infinite loop occurring for empty input.

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• 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.
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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.55%. Comparing base (6bde5d7) to head (9a7a5e5).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5121      +/-   ##
============================================
+ Coverage     37.36%   37.55%   +0.18%     
- Complexity     2350     2364      +14     
============================================
  Files           517      517              
  Lines         15613    15605       -8     
  Branches       2968     2965       -3     
============================================
+ Hits           5834     5860      +26     
+ Misses         9491     9458      -33     
+ Partials        288      287       -1     

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[BamaCharanChhandogi]

Thanks