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## nrune
### Instructions
Write a function that returns the nth `rune` of a `string`. If not possible, it returns `0`.
### Expected function
```go
func NRune(s string, n int) rune {
}
```
### Usage
Here is a possible program to test your function :
```go
package main
import (
"github.com/01-edu/z01"
)
func main() {
z01.PrintRune(NRune("Hello!", 3))
z01.PrintRune(NRune("Salut!", 2))
z01.PrintRune(NRune("Bye!", -1))
z01.PrintRune(NRune("Bye!", 5))
z01.PrintRune(NRune("Ola!", 4))
z01.PrintRune('\n')
}
```
And its output :
```console
$ go run .
la!
$
```
### Notions
- [rune-literals](https://golang.org/ref/spec#Rune_literals)