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## middle_day
### Instructions
Use the [`chrono` crate](https://docs.rs/chrono/0.4.19/chrono/index.html) to create a **function** named `middle_day`. It accepts a year, and returns the weekday of the middle day of that year, wrapped in an `Option`. `chrono::Weekday` has to be referred to as `wd`.
Years with an even number of days do not have a middle day, and should return `None`.
### Expected Function
> You'll need to work out the function signature for yourself.
### Usage
Here is a program to test your function:
```rs
use middle_day::*;
fn main() {
println!("{:?}", middle_day(1022).unwrap());
}
```
And its output:
```sh
$ cargo run
Tue
$
```