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## index
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### Instructions
Write a function that behaves like the `Index` function.
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### Expected function
```go
func Index(s string, toFind string) int {
}
```
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### Usage
Here is a possible program to test your function :
```go
package main
import (
"fmt"
"piscine"
)
func main() {
fmt.Println(piscine.Index("Hello!", "l"))
fmt.Println(piscine.Index("Salut!", "alu"))
fmt.Println(piscine.Index("Ola!", "hOl"))
}
```
And its output :
```console
$ go run .
2
1
-1
$
```
### Notions
- [strings/Index](https://golang.org/pkg/strings/#Index)