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## lastrune
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### Instructions
Write a function that returns the last `rune` of a `string`.
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### Expected function
```go
func LastRune(s string) rune {
}
```
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### Usage
Here is a possible program to test your function :
```go
package main
import (
"github.com/01-edu/z01"
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piscine ".."
)
func main() {
z01.PrintRune(piscine.LastRune("Hello!"))
z01.PrintRune(piscine.LastRune("Salut!"))
z01.PrintRune(piscine.LastRune("Ola!"))
z01.PrintRune('\n')
}
```
And its output :
```console
student@ubuntu:~/[[ROOT]]/test$ go build
student@ubuntu:~/[[ROOT]]/test$ ./test
!!!
student@ubuntu:~/[[ROOT]]/test$
```