Minor - create abstract SimpleAutoTask for simple tool tasks

src/test/java/tools/utils/SimpleAutoTask.java

@@ -0,0 +1,15 @@
+package tools.utils;
+
+import java.util.Scanner;
+
+/**
+ * Abstract class for auto tool tasks that perform exactly the same action for
+ * {@link ToolTask#execute(Scanner)} and {@link AutoToolTask#executeDefault()}.
+ */
+public abstract class SimpleAutoTask implements AutoToolTask {
+
+    @Override
+    public final void execute(Scanner scanner) {
+        executeDefault();
+    }
+}