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## countif
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### Instructions
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Écrire une fonction `CountIf` qui retournes le nombre d'éléments d'un tableau de `string` pour lesquels la fonction `f` retourne `true`.
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### Fonction attendue
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```go
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func CountIf(f func(string) bool, tab []string) 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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tab1 := []string{"Hello", "how", "are", "you"}
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tab2 := []string{"This","1", "is", "4", "you"}
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answer1 := piscine.CountIf(piscine.IsNumeric, tab1)
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answer2 := piscine.CountIf(piscine.IsNumeric, tab2)
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fmt.Println(answer1)
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fmt.Println(answer2)
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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:~/piscine/test$ go build
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student@ubuntu:~/piscine/test$ ./test
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0
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2
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student@ubuntu:~/piscine/test$
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```
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