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## collatzcountdown
### Instructions
Write a function, `CollatzCountdown`, that returns the number of steps necessary to reach 1 using the collatz countdown.
- It must return `-1` if `start` is equal to `0` or negative.
### Expected function
```go
func CollatzCountdown(start int) int {
}
```
### Usage
Here is a possible program to test your function :
```go
package main
import (
6 years ago
"fmt"
"piscine"
)
func main() {
steps := piscine.CollatzCountdown(12)
fmt.Println(steps)
}
```
And its output :
```console
$ go run .
9
$
```