docs(removeDuplicate): fixed subject

subjects/removeduplicate/README.md

@@ -3,6 +3,7 @@
 ### Instructions
 
 Write a function that takes a slice of integers as an argument and returns the slice where all duplicate integers have been removed.
+
 - If the slice is empty, return the slice itself.
 
 ### Expected function
@@ -29,14 +30,16 @@ import (
 func main() {
 	fmt.Println(piscine.RemoveDuplicate([]int{1, 2, 3, 3, 4, 5, 6, 7, 8, 9, 10}))
 	fmt.Println(piscine.RemoveDuplicate([]int{1, 1, 2, 2, 3}))
+	fmt.Println(piscine.RemoveDuplicate([]int{}))
 }
 
 ```
 
-And its output :
+And its output:
 
 ```console
 $ go run .
 [1 2 3 4 5 6 7 8 9 10]
 [1 2 3]
+[]
 ```