Update README.md

README.md

@@ -52,14 +52,14 @@ We believe one of the best ways to learn is learning with others! Join our [offi
 | 01 | [Introduction to Generative AI and LLMs](./01-introduction-to-genai/README.md) | Generative AI and how we landed on the current technology landscape|  Understanding what Generative AI is and how Large Language Models (LLMs) work.                    |
 | 02 | [Exploring and comparing different LLMs](./02-exploring-and-comparing-different-llms/README.md) |Testing, iterating, and comparing different Large Language Models | Select the right model for your use case | 
 | 03 | [Using Generative AI Responsibly](./03-using-generative-ai-responsibly/README.MD)| Understanding the limitations of foundation models and the risks behind AI | Learn how to build Generative AI Applications responsibly 
-| 04 | [Understanding Prompt Engineering Fundamentals](./4-prompt-engineering-fundamentals/) | Hands-on application of Prompt Engineering Best Practices  |  Understand prompt structure & usage|  
+| 04 | [Understanding Prompt Engineering Fundamentals](./04-prompt-engineering-fundamentals/README.md) | Hands-on application of Prompt Engineering Best Practices  |  Understand prompt structure & usage|  
 | 05 | [Creating Advanced Prompts](./05-advanced-prompts/README.md) | Extend your knowledge of prompt engineering by applying different techniques to your prompts | Apply prompt engineering techniques that improve the outcome of your prompts.| 
 | 06 | [Building Text Generation Applications](./06-text-generation-apps/README.md)  | Build a text generation app using Azure OpenAI  | Understand how to efficiently use tokens and temperature to vary the model's output | |
 | 07 | [Building Chat Applications](./07-building-chat-applications/README.md) | Techniques for efficiently building and integrating chat applications.| Identify key metrics and considerations to effectively monitor and maintain the quality of AI-powered chat applications| 
 | 08 | [Building Search Apps Vector Databases](./08-building-search-applications/README.md) | Semantic vs Keyword search.  What are text embeddings and how do they apply to search  | Create an application that uses Embeddings to search for data. | 
 | 09 | [Building Image Generation Applications](./09-building-image-applications/README.md)  | Image generation and why it's useful in building applications| Build an image generation application | 
 | 10 | [Building Low Code AI Applications](./10-building-low-code-ai-applications/)  | Introduction to Generative AI in Power Platform | Build a Student Assignment Tracker App for our education startup with Low Code | |
-| 11 | [Integrating External Applications with Function Calling](./11%20-%20Integrating%20External%20Applications%20with%20Function%20Calling%20/)  | What is function calling and its use cases for applications  | Setup a function call to retrieve data from an external API | |
+| 11 | [Integrating External Applications with Function Calling](./11-intergating-with-function-calling/README.md)  | What is function calling and its use cases for applications  | Setup a function call to retrieve data from an external API | |
 | 12 | [Designing UX for AI Applications](./12-designing-ux-for-ai-applications/) | Designing AI Applications for Trust and Transparency | Apply UX design principles when developing Generative AI Applications | |
 | xx | [Continue Your Learning](./13-continued-learning/README.md)  | Links to continue your learning from each lesson! | Mastering your Generative AI skills | |