fix: move queue to utils

Signed-off-by: Matej Focko <mfocko@redhat.com>

ranked_tree.js

@@ -1,21 +1,3 @@
-class Queue {
-    constructor() {
-        this.q = [];
-    }
-
-    enqueue(x) {
-        this.q.push(x);
-    }
-
-    dequeue() {
-        return this.q.shift();
-    }
-
-    isEmpty() {
-        return this.q.length == 0;
-    }
-}
-
 class RankedTree {
     constructor() {
         this.root = null;

utils.js

@@ -12,3 +12,21 @@ Array.prototype.equals = function (other) {
 
     return true;
 };
+
+class Queue {
+    constructor() {
+        this.q = [];
+    }
+
+    enqueue(x) {
+        this.q.push(x);
+    }
+
+    dequeue() {
+        return this.q.shift();
+    }
+
+    isEmpty() {
+        return this.q.length == 0;
+    }
+}