Rust Crates — Publishing and Using Crates from crates.io and Private Registries

# Cargo.toml
[package]
name = "my_utility"
version = "0.1.0"
edition = "2021"
description = "A useful utility crate"
license = "MIT"
repository = "https://github.com/user/my_utility"

[dependencies]
serde = { version = "1.0", features = ["derive"] }

//! # My Utility
//!
//! `my_utility` is a collection of useful utilities.

/// Adds two numbers together.
pub fn add(a: i32, b: i32) -> i32 {
    a + b
}

/// Greets a person by name.
pub fn greet(name: &str) -> String {
    format!("Hello, {}!", name)
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_add() {
        assert_eq!(add(2, 3), 5);
    }

    #[test]
    fn test_greet() {
        assert_eq!(greet("World"), "Hello, World!");
    }
}

# Publishing
cargo login
cargo package
cargo publish