The addition of DoubleCircularLinkedList.java

[devAlq]

• 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 0% with 57 lines in your changes missing coverage. Please review.

Project coverage is 70.26%. Comparing base (bc9645c) to head (c3dd17a).
Report is 44 commits behind head on master.

Files with missing lines	Patch %	Lines
...datastructures/lists/DoubleCircularLinkedList.java	0.00%	57 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6023      +/-   ##
============================================
+ Coverage     68.79%   70.26%   +1.47%     
- Complexity     4638     4814     +176     
============================================
  Files           621      644      +23     
  Lines         17116    17496     +380     
  Branches       3302     3360      +58     
============================================
+ Hits          11775    12294     +519     
+ Misses         4891     4739     -152     
- Partials        450      463      +13     

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[siriak]

Please remove toString and main, add JUnit tests, and fix PR checks

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contribution!

[github-actions]

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