[kobukuro]

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[Copilot]

Pull Request Overview

This PR adds comprehensive unit tests for the "Richest Customer Wealth" LeetCode problem solution and reorganizes the code structure by moving the implementation to the proper package structure and removing the old file.

• Adds JUnit 5 test class with three test cases covering different scenarios
• Moves the solution from root src directory to proper package structure under com.leetcode.easy
• Removes the old implementation file that contained a main method for testing

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/test/java/com/leetcode/easy/RichestCustomerWealth1672Test.java	New test class with comprehensive unit tests for the wealth calculation algorithm
src/main/java/com/leetcode/easy/RichestCustomerWealth1672.java	Refactored solution with improved documentation and proper package structure
src/RichestCustomerWealth1672.java	Removed old implementation file from root directory

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