## In the file, you will find the following attributes:
### `#![no_std]`
The `#![no_std]` attribute indicates that the program will not make use of the standard library, the `std` crate. Instead it will use the `core` library, a subset of the standard library that does not depend on an underlying operating system (OS).
The `#[entry]` attribute declares the custom entry point of the program. The entry point must be a divergent function whose return type is the never type `!`. The function is not allowed to return; therefore the program is not allowed to terminate.