diff --git a/online_judges/maximizing_xor/maximizing_xor_challenge.ipynb b/online_judges/maximizing_xor/maximizing_xor_challenge.ipynb
index 4ca9ced..86a6051 100644
--- a/online_judges/maximizing_xor/maximizing_xor_challenge.ipynb
+++ b/online_judges/maximizing_xor/maximizing_xor_challenge.ipynb
@@ -36,7 +36,6 @@
    "source": [
     "## Constraints\n",
     "\n",
-
     "See the [HackerRank problem page](https://www.hackerrank.com/challenges/maximizing-xor)."
    ]
   },
@@ -105,10 +104,12 @@
     "        assert_equal(max_xor(10, 15), 7)\n",
     "        print('Success: test_maximizing_xor')\n",
     "\n",
+    "\n",
     "def main():\n",
     "    test = TestMaximingXor()\n",
     "    test.test_maximizing_xor()\n",
     "\n",
+    "\n",
     "if __name__ == '__main__':\n",
     "    main()"
    ]
diff --git a/online_judges/maximizing_xor/maximizing_xor_solution.ipynb b/online_judges/maximizing_xor/maximizing_xor_solution.ipynb
index ebb422a..22f791a 100644
--- a/online_judges/maximizing_xor/maximizing_xor_solution.ipynb
+++ b/online_judges/maximizing_xor/maximizing_xor_solution.ipynb
@@ -35,7 +35,6 @@
    "source": [
     "## Constraints\n",
     "\n",
-
     "See the [HackerRank problem page](https://www.hackerrank.com/challenges/maximizing-xor)."
    ]
   },
@@ -124,10 +123,12 @@
     "        assert_equal(max_xor(10, 15), 7)\n",
     "        print('Success: test_maximizing_xor')\n",
     "\n",
+    "\n",
     "def main():\n",
     "    test = TestMaximingXor()\n",
     "    test.test_maximizing_xor()\n",
     "\n",
+    "\n",
     "if __name__ == '__main__':\n",
     "    main()"
    ]
diff --git a/online_judges/maximizing_xor/test_maximizing_xor.py b/online_judges/maximizing_xor/test_maximizing_xor.py
index 5be8601..c165070 100644
--- a/online_judges/maximizing_xor/test_maximizing_xor.py
+++ b/online_judges/maximizing_xor/test_maximizing_xor.py
@@ -7,9 +7,11 @@ class TestMaximingXor(object):
         assert_equal(max_xor(10, 15), 7)
         print('Success: test_maximizing_xor')
 
+
 def main():
     test = TestMaximingXor()
     test.test_maximizing_xor()
 
+
 if __name__ == '__main__':
     main()
\ No newline at end of file
diff --git a/online_judges/utopian_tree/test_utopian_tree.py b/online_judges/utopian_tree/test_utopian_tree.py
index 5d4d9f5..2af3cd2 100644
--- a/online_judges/utopian_tree/test_utopian_tree.py
+++ b/online_judges/utopian_tree/test_utopian_tree.py
@@ -9,9 +9,11 @@ class TestUtopianTree(object):
         assert_equal(calc_utopian_tree_height(4), 7)
         print('Success: test_utopian_tree')
 
+
 def main():
     test = TestUtopianTree()
     test.test_utopian_tree()
 
+
 if __name__ == '__main__':
     main()
\ No newline at end of file
diff --git a/online_judges/utopian_tree/utopian_tree_challenge.ipynb b/online_judges/utopian_tree/utopian_tree_challenge.ipynb
index 0f42186..5d3a39f 100644
--- a/online_judges/utopian_tree/utopian_tree_challenge.ipynb
+++ b/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()"
    ]
diff --git a/online_judges/utopian_tree/utopian_tree_solution.ipynb b/online_judges/utopian_tree/utopian_tree_solution.ipynb
index fca76ab..1488814 100644
--- a/online_judges/utopian_tree/utopian_tree_solution.ipynb
+++ b/online_judges/utopian_tree/utopian_tree_solution.ipynb
@@ -35,7 +35,6 @@
    "source": [
     "## Constraints\n",
     "\n",
-
     "See the [HackerRank problem page](https://www.hackerrank.com/challenges/utopian-tree)."
    ]
   },
@@ -80,9 +79,6 @@
    },
    "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",
     "    height = 1\n",
     "    if cycles == 0:\n",
@@ -131,10 +127,12 @@
     "        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()"
    ]