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## collatzcountdown
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### Instructions
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Écrire une fonction, `CollatzCountdown`, qui retournes le nombre d'étapes nécéssaires pour atteindre 1 en utilisant le comptage de collatz.
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### FOnction attendue
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```go
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func CollatzCountdown(start int) int {
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}
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```
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### Utilisation
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Voici un éventuel [programme](TODO-LINK) pour tester votre fonction :
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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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steps := piscine.CollatzCountdown(12)
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fmt.Println(steps)
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}
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```
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Et son résultat :
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```console
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student@ubuntu:~/student/test$ go build
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student@ubuntu:~/student/test$ ./test
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10
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student@ubuntu:~/student/test$
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```
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