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## compact
### Instructions
5 years ago
Write a function `Compact` that takes a pointer to an array as parameter and overwrites the elements that points to `nil`.
5 years ago
- Hint : This fonction exists in Ruby.
### Expected function
```go
func Compact(ptr *[]string, length int) int {
}
```
### Usage
Here is a possible [program](TODO-LINK) to test your function :
```go
package main
import fmt
func main() {
array := []string{"hello", " ", "there", " ", "bye"}
ptr := &array
fmt.Println(Compact(ptr, len(array)))
}
```
And its output :
```console
student@ubuntu:~/piscine/test$ go build
student@ubuntu:~/piscine/test$ ./test
3
student@ubuntu:~/piscine/test$
```