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## box_recursion
### Instructions
Using the given code, create the following **associated functions**:
- `new`: which will initialize the `WorkEnvironment` with `grade` set to `None`.
- `add_worker`: which receives two strings, one being the type of worker and the other the name of the worker.
- `remove_worker`: which removes the last worker that was placed in the `WorkEnvironment`, this function returns an `Option` with the name of the worker.
- `search_worker`: which returns a tuple with the name and type of worker.
You must also create a type named `Link`. This will be the connection between the `WorkEnvironment` and `Worker` structures. This will be a recursion type, and it must point to `None` if there is no `Worker` to point to.
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### Expected Functions and structures
```rust
pub struct WorkEnvironment {
pub grade: Link,
}
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pub type Link =
pub struct Worker {
pub worker_type: String,
pub worker_name: String,
pub next_worker: Link,
}
impl WorkEnvironment {
pub fn new() -> WorkEnvironment {}
pub fn add_worker(&mut self, t: String, name: String) {}
pub fn remove_worker(&mut self) -> Option<String> {}
pub fn search_worker(&self) -> Option<(String, String)> {}
}
```
### Usage
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Here is a program to test your function,
```rust
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use box_recursion::*;
fn main() {
let mut list = WorkEnvironment::new();
list.add_worker(String::from("CEO"), String::from("Marie"));
list.add_worker(String::from("Manager"), String::from("Monica"));
list.add_worker(String::from("Normal Worker"), String::from("Ana"));
list.add_worker(String::from("Normal Worker"), String::from("Alice"));
println!("{:?}", list);
println!("{:?}", list.search_worker());
list.remove_worker();
list.remove_worker();
list.remove_worker();
list.remove_worker();
println!("{:?}", list);
}
```
And its output:
```console
$ cargo run
WorkEnvironment { grade: Some(Worker { worker_type: "Normal Worker", worker_name: "Alice", next_worker: Some(Worker { worker_type: "Normal Worker", worker_name: "Ana", next_worker: Some(Worker { worker_type: "Manager", worker_name: "Monica", next_worker: Some(Worker { worker_type: "CEO", worker_name: "Marie", next_worker: None }) }) }) }) }
Some(("Alice", "Normal Worker"))
WorkEnvironment { grade: None }
$
```
### Notions
- [boc](https://doc.rust-lang.org/book/ch15-01-box.html)
- [Module std::option](https://doc.rust-lang.org/std/option/)