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## index
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### Instructions
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Write a function that behaves like the [`Index`](https://golang.org/pkg/strings/#Index) function.
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### Expected function
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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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### Usage
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Here is a possible program to test your function :
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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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And its output :
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```console
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$ go run .
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2
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1
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-1
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$
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```
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