Update CheckVowels.java

[utkarsh2004git]

Optimized the code by extending the Set elements

• 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

All modified and coverable lines are covered by tests ✅

Project coverage is 52.31%. Comparing base (7f60d57) to head (d7e320c).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5492      +/-   ##
============================================
+ Coverage     52.28%   52.31%   +0.02%     
- Complexity     3256     3257       +1     
============================================
  Files           525      525              
  Lines         15185    15186       +1     
  Branches       2887     2887              
============================================
+ Hits           7940     7944       +4     
+ Misses         6920     6919       -1     
+ Partials        325      323       -2     

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[utkarsh2004git]

Optimized the code for src/main/java/com/thealgorithms/strings/CheckVowels.java

[siriak]

The original code is fine, not worth optimizing in this way in my opinion, but thanks for the suggestion anyway!