## reverse_it
### Instructions
Create a function called `reverse_it` that takes a number and returns a string with the number backwards followed by the original number. If the number is negative a char `-` has to 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,
fn main() {
println!("{}", reverse_it(123));
println!("{}", reverse_it(-123));
And its output:
```console
student@ubuntu:~/reverse_it/test$ cargo run
321123
-321123
student@ubuntu:~/reverse_it/test$
