Refactor MathUtil out of BattleController

Assets/Battle/BattleController.cs

@@ -500,7 +500,7 @@ public class BattleController : MonoBehaviour, IBattleEffectApplier, IBattleEffe
             if (i < start || i > end) {
                 newPositions[i] = i;
             } else {
-                int newI = start + TrueMod(
+                int newI = start + MathUtil.TrueMod(
                     i - start - effect.Positions,
                     end - start + 1);
                 newPositions[newI] = i;
@@ -510,10 +510,6 @@ public class BattleController : MonoBehaviour, IBattleEffectApplier, IBattleEffe
         this.state.MoveTeamToNewPositions(effect.Team, newPositions);
     }
 
-    private static int TrueMod(int a, int b) {
-        return (a % b + b) % b;
-    }
-
     public void SetupDefault(DefaultEffect effect) {
         DefaultHeroCard previousDefault = this.state.PlayArea.SetupDefault(effect);
         if (previousDefault != null) {

Assets/Common/MathUtil.cs

@@ -0,0 +1,5 @@
+public static class MathUtil {
+    public static int TrueMod(int a, int b) {
+        return (a % b + b) % b;
+    }
+}

Assets/Common/MathUtil.cs.meta

@@ -0,0 +1,11 @@
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