## rockandroll

### Instructions

Write a function called `RockAndRoll()` that takes an `int` and returns a `string`.

- If the number is divisible by 2, print `rock` followed by a newline `\n`.
- If the number is divisible by 3, print `roll` followed by a newline `\n`.
- If the number is divisible by 2 and 3, print `rock and roll` followed by a newline `\n`.
- If the number is negative return `error: number is negative` followed by a newline `\n`.
- If the number is non divisible return `error: non divisible` followed by a newline `\n`.

### Expected function

```go
func RockAndRoll(n int) string {

}
```
### Usage

Here is a possible program to test your function:

```go
package main

import (
	"fmt"
	"piscine"
)

func main() {
	fmt.Println(piscine.RockAndRoll(4))
	fmt.Println(piscine.RockAndRoll(9))
	fmt.Println(piscine.RockAndRoll(6))
}
```
And its output:

```console
$ go run . | cat -e
rock$
$
roll$
$
rock and roll$
$
```