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## generics_list
### Instructions
Create a linked list of generic values with the following methods.
- `new` which returns a new empty list.
- `push` which adds at the beginning of the list a new element.
- `pop` which deletes the last added element to the list.
- `len` which returns the size of the list.
### Expected Functions
```rust
#[derive(Clone, Debug)]
pub struct List<T> {
pub head: Option<Node<T>>,
}
#[derive(Clone, Debug)]
pub struct Node<T> {
pub value: T,
pub next: Option<Box<Node<T>>>,
}
impl<T> List<T> {
pub fn new() -> List<T> {
}
pub fn push(&mut self, value: T) {
}
pub fn pop(&mut self) {
}
pub fn len(&self) -> usize {
}
}
```
### Usage
Here is a program to test your function.
```rust
use generics_list::*;
fn main() {
let mut new_list_str = List::new();
new_list_str.push("String Test 1");
println!("The size of the list is {}", new_list_str.len());
new_list_str.push("String Test 2");
println!("The size of the list is {}", new_list_str.len());
new_list_str.push("String Test 3");
println!("The size of the list is {}", new_list_str.len());
new_list_str.pop();
println!("The size of the list is {}", new_list_str.len());
}
```
And its output
```console
$ cargo run
The size of the list is 1
The size of the list is 2
The size of the list is 3
The size of the list is 2
$
```