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## collatzcountdown
### Instructions
Write a function, `CollatzCountdown`, that returns the number of steps necessary to reach 1 using the collatz countdown.
### Expected function
```go
func CollatzCountdown(start int) int {
}
```
### Usage
Here is a possible [program](TODO-LINK) 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
student@ubuntu:~/piscine/test$ go build
student@ubuntu:~/piscine/test$ ./test
10
student@ubuntu:~/piscine/test$
```