## box_it
### Instructions
Create the following **functions** :
- `transform_and_save_on_heap` : which accepts a string of numbers separated by spaces. Each number may or may not have a `'k'` as a suffix which represents kilograms. The function transforms those numbers into a vector of `u32` , and saves them in the heap using `Box` .
- `take_value_ownership` : which accepts the return value from `transform_and_save_on_heap` , unboxes the value, and returns it.
### Expected Functions
```rust
pub fn transform_and_save_on_heap(s: String) -> Box< Vec < u32 > > {
}
pub fn take_value_ownership(a: Box< Vec < u32 > >) -> Vec< u32 > {
}
```
### Usage
Here is a program to test your functions
```rust
use box_it::*;
fn main() {
let new_str = String::from("5.5k 8.9k 32");
// creating a variable and we save it in the Heap
let a_h = transform_and_save_on_heap(new_str);
println!("Box value : {:?}", &a_h);
println!("size occupied in the stack : {:?} bytes", (std::mem::size_of_val(&a_h)));
let a_b_v = take_value_ownership(a_h);
println!("value : {:?}", &a_b_v);
println!("size occupied in the stack : {:?} bytes", (std::mem::size_of_val(&a_b_v)));
// whenever the box, in this case "a_h", goes out of scope it will be deallocated, freed
}
```
And its output:
```console
$ cargo run
Box value : [5500, 8900, 32]
size occupied in the stack : 8 bytes
value : [5500, 8900, 32]
size occupied in the stack : 24 bytes
$
```
### Notions
- [smart pointers ](https://doc.rust-lang.org/book/ch15-00-smart-pointers.html )
- [using box ](https://doc.rust-lang.org/book/ch15-01-box.html )
