[kobukuro]

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[Copilot]

Pull Request Overview

Adds a complete solution for LeetCode problem #771 "Jewels and Stones" with proper package structure, comprehensive documentation, and unit tests.

• Moves solution from root directory to proper Maven package structure
• Adds detailed time and space complexity analysis with thorough documentation
• Creates comprehensive unit test suite covering the problem's example cases

Reviewed Changes

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

File	Description
src/main/java/com/leetcode/easy/JewelsAndStones771.java	Implements the main solution with detailed complexity analysis and proper package structure
src/test/java/com/leetcode/easy/JewelsAndStones771Test.java	Adds unit tests covering the example test cases from the problem
src/JewelsAndStones771.java	Removes the original file from the root directory

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