sharma15isha/leetcode-solutions ? reverse-engineered prompt

Build me a clean Java repository for my LeetCode solutions. I want each problem to live in its own folder, with a simple Java solution that is easy to read and follow, since the main goal is to practice and stay consistent. Please keep the code organized, use clear method names and comments only where they help, and make sure the solutions are easy to compare across problems.

If it helps, add a short README that explains what the repo is for and how the solutions are organized. I also want the existing set of problems covered in a neat way, including common tree, array, string, and stack style questions. Keep things simple and practical, and make the structure something I can keep adding to over time. If you need to look up current Java or LeetCode docs online, go ahead.