[kobukuro]

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[Copilot]

Pull Request Overview

This PR adds comprehensive solutions for the "Fibonacci Number" problem (LeetCode 509) with proper project structure and testing. The implementation provides two different approaches: memoization and dynamic programming.

• Moves the existing solution to the proper package structure under src/main/java
• Adds a space-optimized dynamic programming solution alongside the existing memoization approach
• Introduces comprehensive unit tests covering both solution methods

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/FibonacciNumber509.java	Main solution file with memoization and DP implementations, includes detailed complexity analysis
src/test/java/com/leetcode/easy/FibonacciNumber509Test.java	Unit tests covering both solution methods with multiple test cases
src/FibonacciNumber509.java	Removal of old solution file from incorrect location

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