remove piece of solution

Author: sandrabosk

your-code/main.ipynb

@@ -323,31 +323,6 @@
     "    # your code here"
    ]
   },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "# David \n",
-    "def concat_space(a, b):\n",
-    "    '''\n",
-    "    Input:Two strings\n",
-    "    Output: A single string separated by a space\n",
-    "        \n",
-    "    Example:\n",
-    "    Input: 'John', 'Smith'\n",
-    "    Output: 'John Smith'\n",
-    "    '''\n",
-    "    \n",
-    "    return a + \" \" + b\n",
-    "    \n",
-    "# prophet_string = reduce(concat_space,prophet_filter)\n",
-    "# prophet_string    \n",
-    "    \n",
-    "    # your code here"
-   ]
-  },
   {
    "cell_type": "code",
    "execution_count": null,