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## doppelganger
### Instructions
You are given 2 strings. Find out if first string contains second string. If it does, return index of the first string where second string occurs last time. If it does not contain, return "-1"
### Expected function
```go
package main
func DoppelGanger(s, substr string) int {
}
```
```go
package main
import (
"fmt"
piscine ".."
)
func main() {
var result int
result = piscine.DoppelGanger("aaaaaaa", "a")
fmt.Println(result) // 6
result = piscine.DoppelGanger("qwerty", "t")
fmt.Println(result) // 4
result = piscine.DoppelGanger("a", "b")
fmt.Println(result) // -1
}
```