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## doppelganger
## **WARNING! VERY IMPORTANT!**
For this exercise a function will be tested **with the exam own main**. However the student **still needs** to submit a structured program:
This means that:
- The package needs to be named `package main`.
- The submitted code needs one declared function main(```func main()```) even if empty.
- The function main declared needs to **also pass** the `Restrictions Checker`(illegal functions tester). It is advised for the student to just empty the function main after its own testings are done.
- Every other rules are obviously the same than for a `program`.
### 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(big, little string) int {
}
```
```go
package main
import (
"fmt"
)
func main() {
var result int
result = DoppelGanger("aaaaaaa", "a")
fmt.Println(result) // 6
result = DoppelGanger("qwerty", "t")
fmt.Println(result) // 4
result = DoppelGanger("a", "b")
fmt.Println(result) // -1
}
```