Refactor: merge ReverseStackUsingRecursion into ReverseStack and update tests (#6474)

[vickycodebase]

Deleted ReverseStackUsingRecursion.java and ReverseStackUsingRecursionTest.java.

Moved the recursive stack reversal method into ReverseStack.java.

Updated ReverseStackTest.java to include:

Null stack test using assertThrows for IllegalArgumentException.

Tests for empty, single-element, two-element, and multi-element stacks.

Verification that stack size remains unchanged after reversal.

Ensured all tests follow JUnit 5 conventions and project formatting.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.09%. Comparing base (0ff2c06) to head (d7eed5b).

Files with missing lines	Patch %	Lines
...algorithms/datastructures/stacks/ReverseStack.java	75.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6480      +/-   ##
============================================
- Coverage     75.11%   75.09%   -0.03%     
+ Complexity     5575     5570       -5     
============================================
  Files           687      686       -1     
  Lines         19318    19307      -11     
  Branches       3732     3732              
============================================
- Hits          14511    14498      -13     
- Misses         4245     4246       +1     
- Partials        562      563       +1     

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[DenizAltunkapan]

Good observation that both classes follow the same approach. 👍 Please resolve the remaining issues so we can proceed with the merge. @VickySource

[DenizAltunkapan]

why did you remove this file? Please revert this deletion.

[vickycodebase]

Thanks for pointing this out — I’ll restore the file. I had removed it because it seemed duplicate, but I’ll revert the deletion as requested.

[DenizAltunkapan]

Please solve the linting issues in this file

[vickycodebase]

Got it — I’ll fix the linting issues and update the PR.

[vickycodebase]

Thanks for the review and the detailed feedback! I’ll revert the deleted file, address the linting issues, and double-check the null stack handling. I’ll push the updates tomorrow.