R: Move move() into Heading.move(Position)

src/main/kotlin/org/example/Heading.kt

@@ -1,10 +1,10 @@
 package org.example
 
-enum class Heading(val symbol: Char) {
-    NORTH('N'),
-    EAST('E'),
-    SOUTH('S'),
-    WEST('W'),
+enum class Heading(val symbol: Char, val deltaX: Int, val deltaY: Int) {
+    NORTH('N', 0, 1),
+    EAST('E', 1, 0),
+    SOUTH('S', 0, -1),
+    WEST('W', -1, 0),
     ;
 
     fun turnLeft(): Heading =
@@ -23,6 +23,11 @@ enum class Heading(val symbol: Char) {
             NORTH -> EAST
         }
 
+    fun move(
+        x: Int,
+        y: Int,
+    ): Pair<Int, Int> = Pair(x + deltaX, y + deltaY)
+
     override fun toString(): String = symbol.toString()
 
     companion object {