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## tolower
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### Instructions
Write a function that lower cases for each letter in a `string`.
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### Expected function
```go
func ToLower(s string) string {
}
```
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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.ToLower("Hello! How are you?"))
}
```
And its output :
```console
$ go run .
hello! how are you?
$
```
### Notions
- [strings/ToLower](https://golang.org/pkg/strings/#ToLower)