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## atoibase
### Instructions
Write a function that takes two arguments:
- `s`: a numeric `string` in a given [base](<https://simple.wikipedia.org/wiki/Base_(mathematics)>).
- `base`: a `string` representing all the different digits that can represent a numeric value.
And return the integer value of `s` in the given `base`.
If the base is not valid it returns `0`.
Validity rules for a base :
- A base must contain at least 2 characters.
- Each character of a base must be unique.
- A base should not contain `+` or `-` characters.
String number must contain only elements that are in base.
Only valid `string` numbers will be tested.
The function **does not have** to manage negative numbers.
### Expected function
```go
func AtoiBase(s string, base string) int {
}
```
### Usage
Here is a possible program to test your function :
```go
package main
import "fmt"
func main() {
fmt.Println(AtoiBase("125", "0123456789"))
fmt.Println(AtoiBase("1111101", "01"))
fmt.Println(AtoiBase("7D", "0123456789ABCDEF"))
fmt.Println(AtoiBase("uoi", "choumi"))
fmt.Println(AtoiBase("bbbbbab", "-ab"))
}
```
And its output :
```console
$ go run .
125
125
125
125
0
$
```