refactor:RotateSinglyLinkedLists

[Swastik-Swarup-Dash]

I tried to add some classes to make it easier to understand for Begineers

• 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

Attention: Patch coverage is 91.30435% with 2 lines in your changes missing coverage. Please review.

Project coverage is 52.31%. Comparing base (0bd86b3) to head (6d6cf86).

Files with missing lines	Patch %	Lines
.../datastructures/lists/RotateSinglyLinkedLists.java	91.30%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5511      +/-   ##
============================================
+ Coverage     52.29%   52.31%   +0.01%     
- Complexity     3257     3260       +3     
============================================
  Files           525      525              
  Lines         15185    15195      +10     
  Branches       2887     2889       +2     
============================================
+ Hits           7941     7949       +8     
- Misses         6920     6921       +1     
- Partials        324      325       +1     

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