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## atoiprog
##**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
- Write a [function](TODO-LINK) that simulates the behaviour of the `Atoi` function in Go. `Atoi` transforms a number represented as a `string` in a number represented as an `int`.
- `Atoi` returns `0` if the `string` is not considered as a valid number. For this exercise **non-valid `string` chains will be tested**. Some will contain non-digits characters.
- For this exercise the handling of the signs + or - **does have** to be taken into account.
- This function will **only** have to return the `int`. For this exercise the `error` result of atoi is not required.
### Expected function
```go
func Atoi(s string) int {
}
```
### Usage
Here is a possible [program](TODO-LINK) to test your function :
```go
package main
import (
"fmt"
)
func main() {
s := "12345"
s2 := "0000000012345"
s3 := "012 345"
s4 := "Hello World!"
s5 := "+1234"
s6 := "-1234"
s7 := "++1234"
s8 := "--1234"
n := Atoi(s)
n2 := Atoi(s2)
n3 := Atoi(s3)
n4 := Atoi(s4)
n5 := Atoi(s5)
n6 := Atoi(s6)
n7 := Atoi(s7)
n8 := Atoi(s8)
fmt.Println(n)
fmt.Println(n2)
fmt.Println(n3)
fmt.Println(n4)
fmt.Println(n5)
fmt.Println(n6)
fmt.Println(n7)
fmt.Println(n8)
}
```
And its output :
```console
student@ubuntu:~/piscine-go/test$ go build
student@ubuntu:~/piscine-go/test$ ./test
12345
12345
0
0
1234
-1234
0
0
student@ubuntu:~/piscine-go/test$
```