docs(lastword): update provided example to be clearer

subjects/lastword/README.md

@@ -22,15 +22,14 @@ Here is a possible program to test your function :
 package main
 
 import (
+	"fmt"
 	"piscine"
-
-	"github.com/01-edu/z01"
 )
 
 func main() {
-	z01.PrintRune(piscine.LastWord("this        ...       is sparta, then again, maybe    not"))
-	z01.PrintRune(piscine.LastWord(" "))
-	z01.PrintRune(piscine.LastWord(" lorem,ipsum "))
+	fmt.Print(piscine.LastWord("this        ...       is sparta, then again, maybe    not"))
+	fmt.Print(piscine.LastWord(" lorem,ipsum "))
+	fmt.Print(piscine.LastWord(" "))
 }
 ```
 
@@ -39,9 +38,9 @@ And its output :
 ```console
 $ go run . | cat -e
 not$
-$
 lorem,ipsum$
 $
+$
 ```
 
 ### Notions

subjects/lastword/main.go

@@ -1,13 +1,12 @@
 package main
 
 import (
+	"fmt"
 	"piscine"
-
-	"github.com/01-edu/z01"
 )
 
 func main() {
-	z01.PrintRune(piscine.LastWord("this        ...       is sparta, then again, maybe    not"))
-	z01.PrintRune(piscine.LastWord(" "))
-	z01.PrintRune(piscine.LastWord(" lorem,ipsum "))
+	fmt.Print(piscine.LastWord("this        ...       is sparta, then again, maybe    not"))
+	fmt.Print(piscine.LastWord(" lorem,ipsum "))
+	fmt.Print(piscine.LastWord(" "))
 }