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## index
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### Instructions
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Écrire une fonction qui se comporte comme la fonction [`Index`](https://golang.org/pkg/strings/#Index).
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### Fonction attendue
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```go
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func Index(s string, toFind 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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piscine ".."
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)
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func main() {
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fmt.Println(piscine.Index("Hello!", "l"))
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fmt.Println(piscine.Index("Salut!", "alu"))
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fmt.Println(piscine.Index("Ola!", "hOl"))
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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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2
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1
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-1
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student@ubuntu:~/piscine-go/test$
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```
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