Feature: Fully optimized valid parentheses checker

[coder-Basundhara]

Implemented an optimized valid parentheses checker (BalancedBrackets.java) that supports all bracket types: (), [], {}, and <>. The solution handles all edge cases and ensures O(n) time and O(n) space complexity using a stack.

Details:

Edge cases handled:

Empty strings (returns true)

Null input (throws IllegalArgumentException)

Odd-length strings (cannot be balanced)

Strings with non-bracket characters (returns false)

Nested and mixed brackets of any valid combination

Optimizations:

Single pass through the string (O(n) time)

Stack stores only unmatched opening brackets (O(n) space in worst case)

Immediate rejection for unmatched or invalid characters

Testing:

Verified against existing JUnit 5 test cases in BalancedBracketsTest.java

All tests for paired brackets, unbalanced strings, null inputs, and invalid characters pass successfully

Impact:
This implementation ensures that the algorithm is robust, efficient, and ready for use in any project requiring balanced bracket validation.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.32%. Comparing base (883a050) to head (a87d5d0).

Files with missing lines	Patch %	Lines
...ava/com/thealgorithms/stacks/BalancedBrackets.java	86.66%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6767      +/-   ##
============================================
- Coverage     77.33%   77.32%   -0.01%     
- Complexity     6171     6175       +4     
============================================
  Files           721      721              
  Lines         20589    20589              
  Branches       3992     3992              
============================================
- Hits          15922    15920       -2     
  Misses         4055     4055              
- Partials        612      614       +2     

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[DenizAltunkapan]

@coder-Basundhara Please fix the failing workflows so I can start the review.

[github-actions]

This pull request has been automatically closed because its workflows or checks failed and it has been inactive for more than 14 days. Please fix the workflows and reopen if you'd like to continue. Merging from main/master alone does not count as activity.