Rename id in Delete methods to index

atom.go

@@ -26,13 +26,13 @@ func addToSlice[C Countable](slice *[]C, countable C) {
 
 // deleteFromSlice deletes the Countable with the index from the *[]Countable.
 // It return an error.
-func deleteFromSlice[C Countable](slice *[]C, id int) error {
+func deleteFromSlice[C Countable](slice *[]C, index int) error {
 	length := len(*slice)
-	if id > length {
-		return fmt.Errorf("id %v out of range %v", id, length)
+	if index > length {
+		return fmt.Errorf("id %v out of range %v", index, length)
 	}
 
-	*slice = append((*slice)[:id], (*slice)[id+1:]...)
+	*slice = append((*slice)[:index], (*slice)[index+1:]...)
 	return nil
 }