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## nruneprog
### Instructions
Write a function that returns the nth `rune` of a `string`.
### Expected output :
```console
student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello" 2
e
student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello" 4 | cat -e
l$
student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello" 5
o
student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello"
student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello" f | cat -e
"f" is not an integer value$
student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello" 9
Invalid position: "9" in "hello"
student@ubuntu:~/piscine-go/nruneprog$
```