R: Finish refine abstractions (add moveBy to position class and use in RS)

TECHDEBT.md

@@ -1,14 +1,14 @@
 # TODO
-- [ ] Refine Abstractions
-  - [ ] long parameter list
-  - [ ] data clump
-  - [ ] primitive obsession
-  - [ ] middle man
+- [x] Refine Abstractions
+  - [x] long parameter list
+  - [x] data clump
+  - [x] primitive obsession
+  - [x] middle man
 
 # Mikado
-- [x] Replace x, y with Position in Heading.move()
-  - [x] RoverState.move use position
-- [x] Return position in move() instead of Pair
+- [x] remove move() from heading
+  - [x] use position.moveBy in RoverState.move
+  - [x] add moveBy to Position class
 
 # RPP
 - [ ] Design Patterns
@@ -63,3 +63,7 @@
     - [x] use position in move()
       - [x] Add position to RoverState
         - [x] Create Position data class
+- [x] Replace x, y with Position in Heading.move()
+  - [x] RoverState.move use position
+- [x] Return position in move() instead of Pair
+

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

@@ -23,8 +23,6 @@ enum class Heading(val symbol: Char, val vector: Vector) {
             NORTH -> EAST
         }
 
-    fun move(position: Position): Position = position.copy(x = position.x + vector.deltaX, position.y + vector.deltaY)
-
     override fun toString(): String = symbol.toString()
 
     companion object {

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

@@ -4,5 +4,7 @@ data class Position(
     val x: Int = 0,
     val y: Int = 0,
 ) {
+    fun moveBy(vector: Vector): Position = copy(x = x + vector.deltaX, y = y + vector.deltaY)
+
     override fun toString(): String = "$x $y"
 }

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

@@ -8,5 +8,5 @@ data class RoverState(
 
     fun turnRight(): RoverState = copy(heading = heading.turnRight())
 
-    fun move(): RoverState = copy(position = heading.move(position))
+    fun move(): RoverState = copy(position = position.moveBy(heading.vector))
 }