Fixed Type conversion error in BloomFilter.java Added RemoveStars and ComplexNumberMultiplication

[SwarritSrivastava]

• 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

What does this PR do?

Adds two new string algorithms:

1. RemoveStars

   • Removes each '*' and its closest non-star character to the left.
   • Example: "abbc**def*g" → "abdeg"

2. ComplexNumberMultiplication

   • Multiplies two complex numbers represented as strings.
   • Example: "1+1i" * "1+1i" → "0+2i"

Checklist

• Added Javadoc comments
• Added JUnit tests
• Code passes Checkstyle, PMD, and SpotBugs
• Verified locally with mvn clean verify

This is my contribution for Hacktoberfest 2025

[codecov-commenter]

Codecov Report

❌ Patch coverage is 62.79070% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.42%. Comparing base (b1aa896) to head (2f43688).

Files with missing lines	Patch %	Lines
...rithms/datastructures/bloomfilter/BloomFilter.java	20.00%	8 Missing and 8 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6678      +/-   ##
============================================
- Coverage     76.45%   76.42%   -0.04%     
- Complexity     5985     5992       +7     
============================================
  Files           716      718       +2     
  Lines         20265    20307      +42     
  Branches       3929     3940      +11     
============================================
+ Hits          15494    15519      +25     
- Misses         4180     4189       +9     
- Partials        591      599       +8     

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