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## reverse_it
### Instructions
Create a function named `reverse_it`, that takes a number. It should return a string with the number reversed, followed by the original number. If the number is negative, a `-` should be added to the beginning of the string.
### Expected Functions
```rust
pub fn reverse_it(v: i32) -> String {
}
```
### Usage
Here is a program to test your function,
```rust
fn main() {
println!("{}", reverse_it(123));
println!("{}", reverse_it(-123));
}
```
And its output:
```console
$ cargo run
321123
-321123
$
```