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## sum
### Instructions
Write a function that takes two single digit numbers as a string and returns the sum as an int. If the number of digits from one of the arguments is more than one, return 0.
### Expected function
```go
func Sum(a,b string) int {
}
```
### Usage
Here is a possible program to test your function :
```go
package main
import (
"piscine"
"fmt"
)
func main() {
fmt.Println(piscine.Sum("1", "2"))
fmt.Println(piscine.Sum("-4", "0"))
fmt.Println(piscine.Sum("7", "-3"))
}
```
And its output :
```console
$ go run . | cat -e
3$
-4$
4$
$
```
