Added code box for user's exercise

Author: IdoElk

week2/5_String_Methods.ipynb

@@ -622,6 +622,13 @@
     "</div>"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
   {
    "cell_type": "markdown",
    "metadata": {},