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## borrow_me_the_reference
### Instructions
> Ownership is Rust's most unique feature. It enables Rust to make memory safety guarantees without needing a garbage collector.
Understanding ownership is essential to take full advantage of Rust capabilities, it influences almost all aspects of the language.
Create the following functions:
- `delete_and_backspace`: which receives a borrowed string, and processes it. `-` represents the backspace key and `+` represents the delete key, so that `"helll-o"` and `"he+lllo"` are both converted to `"hello"`. The `-` and `+` characters should be removed from the string.
- `do_operations`: which borrows a Vector of string literals representing simple addition and subtraction equations. The function should replace the operation with the result.
### Expected Functions
```rust
pub fn delete_and_backspace(s: &mut String) {
}
pub fn do_operations(v: &mut Vec<String>) {
}
```
### Usage
Here is a program to test your function
```rust
use borrow_me_the_reference::{delete_and_backspace, do_operations};
fn main() {
let mut a = String::from("bpp--o+er+++sskroi-++lcw");
let mut b: Vec<String> = vec![
"2+2".to_string(),
"3+2".to_string(),
"10-3".to_string(),
"5+5".to_string(),
];
delete_and_backspace(&mut a);
do_operations(&mut b);
println!("{:?}", (a, b));
}
```
And its output
```console
$ cargo run
("borrow", ["4", "5", "7", "10"])
$
```
### Notions
- [Ownership](https://doc.rust-lang.org/book/ch04-00-understanding-ownership.html)