Mountain was been modified but i let her in origin implementation

src/main/java/model/Mountain.java

@@ -2,14 +2,17 @@ package model;
 
 import util.Position;
 
+import java.util.HashSet;
+import java.util.Set;
+
 public class Mountain {
     private final Position position;
 
     public Mountain(Position position) {
         this.position = position;
     }
-
     public Position getPosition(){
         return position;
     }
+
 }