Rust's high-performance memory safety features help eliminate an entire class of vulnerabilities, making it an attractive choice for mission-critical applications. Another important advantage of using Rust is the availability of a large number of libraries, i.e., crates, that make it easy to develop applications in Rust. However, crates need to be specially designed, i.e., no_std compatible, to be usable on embedded systems. Unfortunately, the majority of the crates are not no_std compatible. In this work, we tackle this problem by developing an automated code refactoring tool, Aunor, to specialize a given crate to be no_std compatible in a valid and backward compatible manner. Our preliminary evaluation shows Aunor is effective and could automatically convert 318 crates.