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## tolower
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### Instructions
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Écrire une fonction qui met en minuscule chaque lettre d'une `string`.
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### Fonction attendue
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```go
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func ToLower(s string) string {
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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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fmt.Println(piscine.ToLower("Hello! How are you?"))
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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:~/[[ROOT]]/test$ go build
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student@ubuntu:~/[[ROOT]]/test$ ./test
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hello! how are you?
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student@ubuntu:~/[[ROOT]]/test$
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```
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