refactor: BinaryToHexadecimal

[alxkm]

Refactoring BinaryToHexadecimal.
Adding tests for incorrect cases.

• 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 42.67%. Comparing base (ec30592) to head (4f79a3c).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5331      +/-   ##
============================================
+ Coverage     42.63%   42.67%   +0.03%     
- Complexity     2643     2646       +3     
============================================
  Files           522      522              
  Lines         15491    15488       -3     
  Branches       2948     2950       +2     
============================================
+ Hits           6605     6609       +4     
+ Misses         8603     8596       -7     
  Partials        283      283              

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