Fix extra space issue and LLM hallucinating

The extra space makes LLM hallucinate.

With that space, the answer is received:
```
Final Answer: The current weather in London is not available, but the weather in London is sunny with low temperatures.
```

Without:
```
Final Answer: The current weather in London is sunny with low temperatures.
```

dummy_agent_library.ipynb

@@ -378,7 +378,7 @@
       "Thought: I now know the final answer\n",
       "Final Answer: the final answer to the original input question\n",
       "\n",
-      "Now begin! Reminder to ALWAYS use the exact characters `Final Answer:` when you provide a definitive answer. \n",
+      "Now begin! Reminder to ALWAYS use the exact characters `Final Answer:` when you provide a definitive answer.\n",
       "<|eot_id|><|start_header_id|>user<|end_header_id|>\n",
       "What's the weather in London ?\n",
       "<|eot_id|><|start_header_id|>assistant<|end_header_id|>\n",