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