Sort character by frequency

[lieutenant-Rohit]

Added SortCharacterByFrequency algorithm using HashMap and Priority Queue

• Counts frequency of characters using HashMap
• Uses a max-heap (PriorityQueue) to sort characters by frequency
• Includes JUnit test cases for validation
• Code formatted using clang-format and follows project conventions

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.55%. Comparing base (b3e31b5) to head (732517c).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7391      +/-   ##
============================================
+ Coverage     79.53%   79.55%   +0.02%     
- Complexity     7176     7184       +8     
============================================
  Files           798      799       +1     
  Lines         23467    23486      +19     
  Branches       4617     4621       +4     
============================================
+ Hits          18665    18685      +20     
  Misses         4055     4055              
+ Partials        747      746       -1     

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[felseje]

I went through the Checkstyle findings and left some comments to help guide the necessary changes.

[felseje]

Instead of using a single-line if statement like:

if (diff == 0) return a.getKey() - b.getKey();

please use braces:

if (diff == 0) {
return a.getKey() - b.getKey();
}

[felseje]

Avoid using wildcard imports (e.g., java.util.*). Please import only the specific classes you need.

[felseje]

Avoid using wildcard imports (e.g., org.junit.jupiter.api.Assertions.*). Please import only the specific classes you need.

[felseje]

Hello, @lieutenant-Rohit ! How’s it going?

I’ve left a code review based on the compilation errors from the automated build. Hope the comments help!

[felseje]

To use the Map and HashMap classes, you will need to import them:

import java.util.Map;
import java.util.HashMap;

[felseje]

To use the PriorityQueue class, you will need to import it:

import java.util.PriorityQueue;

[felseje]

To use @Test annotation, you will need to import it:

import org.junit.jupiter.api.Test;

[felseje]

To use assertTrue() method, you will need to import it:

import static org.junit.jupiter.api.Assertions.assertTrue;

[felseje]

To use assertEquals() method, you will need to import it:

import static org.junit.jupiter.api.Assertions.assertEquals;

[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.