[kobukuro]

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[Copilot]

Pull Request Overview

This PR adds a solution for LeetCode problem #1662 "Check If Two String Arrays are Equivalent" by creating a new implementation with proper package structure and comprehensive unit tests. The solution optimizes the previous implementation by using String.join() instead of manual string concatenation.

• Refactored the solution to use String.join() for better performance
• Added proper package structure and documentation with complexity analysis
• Created comprehensive unit tests covering all 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/CheckIfTwoStringArraysAreEquivalent1662.java	New solution implementation with optimized string concatenation and complexity analysis
src/test/java/com/leetcode/easy/CheckIfTwoStringArraysAreEquivalent1662Test.java	Comprehensive unit tests covering all example scenarios
src/CheckIfTwoStringArraysAreEquivalent1662.java	Removed old implementation file

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