## name_initials
### Instructions
Create a **function** named `initials` . This function will receive a vector of string literals with names, and return a vector of Strings with the initials of each name.
### Expected Functions
```rust
pub fn initials(names: Vec< & str>) -> Vec< String > {
}
```
> Your heap allocations will be monitored to ensure that you do not make too many allocations, and that your allocations are reasonably sized.
### Usage
Here is a program to test your function:
```rust
use name_initials::initials;
fn main() {
let names = vec!["Harry Potter", "Someone Else", "J. L.", "Barack Obama"];
println!("{:?}", initials(names));
}
```
And its output
```console
$ cargo run
["H. P.", "S. E.", "J. L.", "B. O."]
$
```
### Notions
- [stack and heap ](https://doc.rust-lang.org/1.22.0/book/first-edition/the-stack-and-the-heap.html )
