diff --git a/arrays-strings/replace_char.ipynb b/arrays-strings/replace_char.ipynb
index d1d11cd..4bfb436 100644
--- a/arrays-strings/replace_char.ipynb
+++ b/arrays-strings/replace_char.ipynb
@@ -60,10 +60,10 @@
     "        str1 = bytearray(' ||')\n",
     "        str2 = bytearray(' foo bar ||||||')\n",
     "        str3 = bytearray('foo')\n",
-    "        encode_spaces(str0, 0)\n",
-    "        encode_spaces(str1, 1)\n",
-    "        encode_spaces(str2, 9)\n",
-    "        encode_spaces(str3, 3)\n",
+    "        func(str0, 0)\n",
+    "        func(str1, 1)\n",
+    "        func(str2, 9)\n",
+    "        func(str3, 3)\n",
     "        assert_equal(str0, None)\n",
     "        assert_equal(str1, '%20')\n",
     "        assert_equal(str2, '%20foo%20bar%20')\n",
@@ -157,10 +157,7 @@
     "    return re.sub(' ', '%20', string)\n",
     "\n",
     "def encode_spaces_alt2(string):\n",
-    "    return string.replace(' ', '%20')\n",
-    "\n",
-    "run_tests(encode_spaces_alt)\n",
-    "run_tests(encode_spaces_alt2)"
+    "    return string.replace(' ', '%20')"
    ]
   }
  ],