diff --git a/Cargo.toml b/Cargo.toml
index 863e846..740a020 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,3 +8,4 @@ edition = "2018"
 
 [dependencies]
 clap = "2.33.3"
+queues = "1.1.0"
diff --git a/src/main.rs b/src/main.rs
index 54baa26..dd5a77a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,4 +1,5 @@
 use clap::{App, Arg};
+use queues::*;
 use std::fs;
 use std::io;
 
@@ -23,6 +24,10 @@ impl World {
             Orientation::W => '←',
         }
     }
+    /// Check if a position is free.
+    fn empty_position(&mut self, p: Position) -> bool {
+        self.map[(p.x * p.y) as usize] == '.'
+    }
 }
 
 /// Struct to store robot position.
@@ -37,6 +42,7 @@ struct Robot {
     id: u32,
     o: Orientation,
     p: Position,
+    q: Queue<char>,
 }
 
 impl Robot {
@@ -68,19 +74,19 @@ impl Robot {
         }
     }
     /// Apply North orientation to the robot.
-    fn to_north(&mut self) {
+    fn turn_north(&mut self) {
         self.o = Orientation::N
     }
     /// Apply South orientation to the robot.
-    fn to_south(&mut self) {
+    fn turn_south(&mut self) {
         self.o = Orientation::S
     }
     /// Apply East orientation to the robot.
-    fn to_east(&mut self) {
+    fn turn_east(&mut self) {
         self.o = Orientation::E
     }
     /// Apply West orientation to the robot.
-    fn to_west(&mut self) {
+    fn turn_west(&mut self) {
         self.o = Orientation::W
     }
 }