Fix #13, PEP8-ify notebooks.

online_judges/utopian_tree/utopian_tree_challenge.ipynb

@@ -36,7 +36,6 @@
    "source": [
     "## Constraints\n",
     "\n",
-
     "See the [HackerRank problem page](https://www.hackerrank.com/challenges/utopian-tree)."
    ]
   },
@@ -73,9 +72,6 @@
    },
    "outputs": [],
    "source": [
-    "# cycles = 0, print 1: base case\n",
-    "# cycles = 1, print 2: i = 1: 1 * 2\n",
-    "# cycles = 4, print 7: i = 1: 1 * 2, i = 2: 2 + 1, i = 3: 3 * 2, i = 4: 6 + 1\n",
     "def calc_utopian_tree_height(cycles):\n",
     "    # TODO: Implement me\n",
     "    pass"
@@ -110,10 +106,12 @@
     "        assert_equal(calc_utopian_tree_height(4), 7)\n",
     "        print('Success: test_utopian_tree')\n",
     "\n",
+    "\n",
     "def main():\n",
     "    test = TestUtopianTree()\n",
     "    test.test_utopian_tree()\n",
     "\n",
+    "\n",
     "if __name__ == '__main__':\n",
     "    main()"
    ]