update strings

Author: rambasnet

notebooks/Ch05-Iterations.ipynb

@@ -928,8 +928,7 @@
     "- FizzBuzz - https://open.kattis.com/problems/fizzbuzz\n",
     "- Jumbo Javelin - https://open.kattis.com/problems/jumbojavelin\n",
     "- Rating Problems - https://open.kattis.com/problems/ratingproblems\n",
-    "- Quality-Adjust Life-Year - https://open.kattis.com/problems/qaly\n",
-    "- File Extension - https://open.kattis.com/problems/nafnauki"
+    "- Quality-Adjust Life-Year - https://open.kattis.com/problems/qaly"
    ]
   },
   {

notebooks/Ch06-Strings.ipynb

@@ -2012,6 +2012,13 @@
     "- Getting Wood - https://open.kattis.com/problems/gettingwood"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
   {
    "cell_type": "code",
    "execution_count": null,