Update Solution.kt 2E

Author: Boris Testov

kotlin/sprint2/E/Solution.kt

@@ -1,13 +1,10 @@
 // <template>
-class Node<V> {
-    var value: V
-    var next: Node<V>?
-    var prev: Node<V>?
-
-    constructor(value: V) {
-        this.value = value
-        next = null
-        prev = null
+class Node<V>(var value: V) {
+    var next: Node<V>? = null
+    var prev: Node<V>? = null
+
+    fun hasNext(): Boolean {
+        return next != null
     }
 }
 // <template>
@@ -41,4 +38,4 @@ fun test() {
     assert(node1?.next === node0)
     assert(node1?.prev === node2)
     assert(node0?.prev === node1)
-}
+}