implement orientation change and instructions to the robot

src/main.rs

@@ -22,6 +22,52 @@ struct Robot {
     p: Position,
 }
 
+impl Robot {
+    /// Apply forward instruction to the robot.
+    fn move_forward(&mut self) {
+        match self.o {
+            Orientation::N => self.p.y -= 1,
+            Orientation::S => self.p.y += 1,
+            Orientation::E => self.p.x += 1,
+            Orientation::W => self.p.x -= 1,
+        }
+    }
+    /// Apply right instruction to the robot.
+    fn move_right(&mut self) {
+        match self.o {
+            Orientation::N => self.p.x += 1,
+            Orientation::S => self.p.x -= 1,
+            Orientation::E => self.p.y += 1,
+            Orientation::W => self.p.y -= 1,
+        }
+    }
+    /// Apply left instruction to the robot.
+    fn move_left(&mut self) {
+        match self.o {
+            Orientation::N => self.p.x -= 1,
+            Orientation::S => self.p.x += 1,
+            Orientation::E => self.p.y -= 1,
+            Orientation::W => self.p.y += 1,
+        }
+    }
+    /// Apply North orientation to the robot.
+    fn to_north(&mut self) {
+        self.o = Orientation::N
+    }
+    /// Apply South orientation to the robot.
+    fn to_south(&mut self) {
+        self.o = Orientation::S
+    }
+    /// Apply East orientation to the robot.
+    fn to_east(&mut self) {
+        self.o = Orientation::E
+    }
+    /// Apply West orientation to the robot.
+    fn to_west(&mut self) {
+        self.o = Orientation::W
+    }
+}
+
 /// Enum to store all possible orientations.
 enum Orientation {
     N,