Added a magnitiude addition helper function.

src/main/java/ca/recrown/islandsurvivalcraft/Utilities.java

@@ -18,4 +18,11 @@ public class Utilities {
         }
         return res;
     }
+
+    public static int addMagnitude(int value, int add) {
+        boolean negative = false;
+        if (value < 0) negative = true;
+        int res = Math.abs(value) + add;
+        return negative ? - res : res;
+    }
 }

src/test/java/ca/recrown/islandsurvivalcraft/UtilitiesTest.java

@@ -39,4 +39,13 @@ public class UtilitiesTest {
         assertEquals(first, expectedFirst);
         assertEquals(second, expectedSecond);
     }
+
+    @Test
+    public void testMagnitudeAddPositive() {
+        assertEquals(2, Utilities.addMagnitude(1, 1));
+    }
+    @Test
+    public void testMagnitudeAddNegative() {
+        assertEquals(-2, Utilities.addMagnitude(-1, 1));
+    }
 }