## strlenprog

### Instructions

- Write a function that counts the `runes` of a `string` and that returns that count.

### Expected function

```go
func StrLen(s string) int {

}
```

### Usage

Here is a possible program to test your function :

```go
package main

import "fmt"

func main() {
	s := "Hello World!"
	nb := StrLen(s)
	fmt.Println(nb)
}
```

And its output :

```console
student@ubuntu:~/[[ROOT]]/test$ go build
student@ubuntu:~/[[ROOT]]/test$ ./test
12
student@ubuntu:~/[[ROOT]]/test$
```