How to import functions from another file in Rust?

I have the following Rust project:

How to import functions from another file in Rust?

I have the following Rust project:

How to import functions from another file in Rust?

I have the following Rust project:

How to import functions from another file in Rust?

I have the following Rust project:

How to import functions from another file in Rust?

I have the following Rust project: