what is leetcode_prelude fr?

leetcode_prelude is a helper toolkit for people who solve algorithm problems on LeetCode using the Rust programming language. LeetCode problems frequently involve data structures like binary trees and linked lists, which are tedious to set up by hand in Rust. This project provides shortcuts so you can create those structures in a single line of code, letting you focus on solving the actual problem rather than wrestling with boilerplate setup. The toolkit works through Rust macros, which are essentially shorthand commands that expand into longer code behind the scenes. For example, you can write btree![1, 2, 2, null, null, 3, 3] to build a binary tree, or linkedlist![1, 2, 3] to create a linked list. It also includes a feature that takes LeetCode's JSON test cases and converts them directly into Rust test code, so you don't have to manually translate each test case. A few other utilities handle tasks like creating lists of strings and comparing vectors regardless of element order. The primary audience is Rust programmers practicing for technical interviews or competitive programming on LeetCode. Rust's strict type system and verbose syntax can slow you down during timed coding challenges, and this project removes some of that friction. For instance, when a LeetCode problem asks you to implement a data structure like a trie, the toolkit can generate the corresponding test boilerplate straight from the problem's own JSON example. The project is small and purpose-built, designed purely as a convenience layer rather than something you would use in production software. It is published as a Rust crate, meaning you add it as a dependency in your project configuration file and the helper commands become available immediately.