Folder Structure

lr_grustep/
|-- src/
|   |-- main.rs       # Main entry point for the CLI app
|   |-- lib.rs        # Module file if you have library code
|   |-- utils.rs      # Additional utility functions or modules
|-- tests/
|   |-- unit.rs       # Unit tests
|-- Cargo.toml        # Rust package manifest
|-- README.md         # Documentation for your project
|-- License           # License information
|-- .gitignore        # Git ignore file

Explanation of each folder/file:

• src/: This is where your source code resides.

• src/main.rs: This file contains the main entry point for your CLI application. It's where the execution of your program starts. You'll define your main function here.

• src/lib.rs: This file is used to define a Rust library. If your project involves reusable code that could be used by other programs, you might organize it into a library. If not, this file may not be necessary for simpler projects.

• src/utils.rs: This is an example additional module or file where you can place utility functions or code that doesn't fit directly into the main entry point. It's a good practice to organize your code into modules for better maintainability.

• tests/: This directory is used for organizing your tests.

• Cargo.toml: This is the Rust package manifest. It contains metadata about your project, dependencies, and other configurations. It's used by Cargo¹, the Rust package manager, to build, test, and package your project.

• README.md: Documentation for your project. It should include information about how to install, configure, and use your CLI app.

• LICENSE:² Include a license file that specifies the terms under which your software is distributed.

• .gitignore: This file specifies intentionally untracked files that Git should ignore. It's useful for preventing certain files and directories from being accidentally committed to version control.

This structure provides a good separation of concerns and makes it easy to expand your project in the future.