tracks/cpp/config.json in trackler-2.0.8.31 vs tracks/cpp/config.json in trackler-2.0.8.32

@@ -14,9 +14,16 @@
     "point-mutations"
   ],
   "exercises": [
     {
       "difficulty": 1,
+      "slug": "hello-world",
+      "topics": [
+        "strings"      
+      ]
+    },
+    {
+      "difficulty": 1,
       "slug": "bob",
       "topics": []
     },
     {
       "difficulty": 1,