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## strlen
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### Instructions
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- Écrire une fonction qui compte le nombre de `runes` d'une `string` et qui retourne le nombre trouvé.
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### Fonction attendue
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```go
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func StrLen(str string) int {
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}
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```
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### Utilisation
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Voici un éventuel [programme](TODO-LINK) pour tester votre fonction :
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```go
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package main
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import (
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"fmt"
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)
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func main() {
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str := "Hello World!"
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nb := StrLen(str)
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fmt.Println(nb)
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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:~/piscine-go/test$ go build
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student@ubuntu:~/piscine-go/test$ ./test
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12
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student@ubuntu:~/piscine-go/test$
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```
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