Fix the incorrect string formatting and ensure the subcategories variable is embedded in the prompt (#1770)

Author: yuichielectric

examples/How_to_combine_GPT4o_with_RAG_Outfit_Assistant.ipynb

@@ -331,16 +331,16 @@
     "            \"content\": [\n",
     "                {\n",
     "                \"type\": \"text\",\n",
-    "                \"text\": \"\"\"Given an image of an item of clothing, analyze the item and generate a JSON output with the following fields: \"items\", \"category\", and \"gender\". \n",
+    "                \"text\": f\"\"\"Given an image of an item of clothing, analyze the item and generate a JSON output with the following fields: \"items\", \"category\", and \"gender\".\n",
     "                           Use your understanding of fashion trends, styles, and gender preferences to provide accurate and relevant suggestions for how to complete the outfit.\n",
     "                           The items field should be a list of items that would go well with the item in the picture. Each item should represent a title of an item of clothing that contains the style, color, and gender of the item.\n",
     "                           The category needs to be chosen between the types in this list: {subcategories}.\n",
     "                           You have to choose between the genders in this list: [Men, Women, Boys, Girls, Unisex]\n",
     "                           Do not include the description of the item in the picture. Do not include the ```json ``` tag in the output.\n",
-    "                           \n",
+    "\n",
     "                           Example Input: An image representing a black leather jacket.\n",
     "\n",
-    "                           Example Output: {\"items\": [\"Fitted White Women's T-shirt\", \"White Canvas Sneakers\", \"Women's Black Skinny Jeans\"], \"category\": \"Jackets\", \"gender\": \"Women\"}\n",
+    "                           Example Output: {{\"items\": [\"Fitted White Women's T-shirt\", \"White Canvas Sneakers\", \"Women's Black Skinny Jeans\"], \"category\": \"Jackets\", \"gender\": \"Women\"}}\n",
     "                           \"\"\",\n",
     "                },\n",
     "                {\n",