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6 years ago
## join
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### Instructions
Write a function that returns the concatenation of all the `string`s of a slice of `string`s **separated** by the separator passed in the argument `sep`.
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### Expected function
```go
func Join(strs []string, sep string) string {
}
```
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### Usage
Here is a possible program to test your function :
```go
package main
import (
"fmt"
"piscine"
)
func main() {
toConcat := []string{"Hello!", " How", " are", " you?"}
fmt.Println(piscine.Join(toConcat, ":"))
}
```
And its output :
```console
$ go run .
Hello!: How: are: you?
$
```
### Notions
- [strings/Join](https://golang.org/pkg/strings/#Join)