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## firstrune
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### Instructions
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Écrire une fonction qui retourne la première `rune` d'une `string`.
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### Fonction attendue
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```go
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func FirstRune(s string) rune {
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}
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```
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### Utilisation
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Voici un éventuel programme pour tester votre fonction :
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```go
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package main
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import (
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"github.com/01-edu/z01"
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piscine ".."
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)
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func main() {
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z01.PrintRune(piscine.FirstRune("Hello!"))
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z01.PrintRune(piscine.FirstRune("Salut!"))
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z01.PrintRune(piscine.FirstRune("Ola!"))
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z01.PrintRune('\n')
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}
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```
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Et son résultat :
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```console
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student@ubuntu:~/[[ROOT]]/test$ go build
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student@ubuntu:~/[[ROOT]]/test$ ./test
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HSO
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student@ubuntu:~/[[ROOT]]/test$
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```
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