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## setspace
### Instructions
Write a function that takes a PascalCase `string` and returns the same `string` with a space between each word.
- The function must return an empty `string` if the input is an empty `string`.
- The function must return `"Error"` if the input `string` is not a PascalCase `string`.
- The PascalCase begins with a capital letter, and each word begins with a capital letter without a space between them, for example: "HelloWorld" is a valid PascalCase `string`.
- The PascalCase cannot contain any non-alphabetic character, for example: "Hello World12" is not a valid PascalCase `string`.
### Expected function
```go
func SetSpace(s string) string {
}
```
### Usage
Here is a possible program to test your function:
```go
package main
import (
"fmt"
"piscine"
)
func main() {
fmt.Println(piscine.SetSpace("HelloWorld"))
fmt.Println(piscine.SetSpace("HelloWorld12"))
fmt.Println(piscine.SetSpace("Hello World"))
fmt.Println(piscine.SetSpace(""))
fmt.Println(piscine.SetSpace("LoremIpsumWord"))
}
```
And its output:
```console
$ go run . | cat -e
Hello World$
Error$
Error$
$
Lorem Ipsum Word$
$
```