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# isalpha
## Instructions
Write a function that returns `true` if the `string` passed in parameter only contains alphanumerical characters, and that returns `false` otherwise.
## Expected function
```go
func IsAlpha(str string) bool {
}
```
## Usage
Here is a possible [program](TODO-LINK) to test your function :
```go
package main
import (
"fmt"
piscine ".."
)
func main() {
fmt.Println(piscine.IsAlpha("Hello! How are you?"))
fmt.Println(piscine.IsAlpha("HelloHowareyou"))
fmt.Println(piscine.IsAlpha("What's this 4?"))
fmt.Println(piscine.IsAlpha("Whatsthis4"))
}
```
And its output :
```console
student@ubuntu:~/piscine/test$ go build
student@ubuntu:~/piscine/test$ ./test
false
true
false
true
student@ubuntu:~/piscine/test$
```