diff --git a/debugger.py b/debugger.py
index 668c208dd..41652b785 100644
--- a/debugger.py
+++ b/debugger.py
@@ -1,49 +1,54 @@
-import modal
 import os
-
-stub = modal.Stub("smol-debugger-v1")
-generatedDir = "generated"
-openai_image = modal.Image.debian_slim().pip_install("openai")
-
-
-
-def read_file(filename):
+import modal
+from typing import Dict
+
+# Constants
+MODAL = modal.Stub("smol-debugger-v1")
+GENERATED_DIR = "generated"
+BLOB_EXTENSIONS = ['.png', '.jpg', '.jpeg', '.gif', '.bmp', '.svg', '.ico', '.tif', '.tiff']
+OPENAI_IMAGE = modal.Image.debian_slim().pip_install("openai")
+
+def read_file(filename: str) -> str:
+    """
+    Reads a file and returns its content.
+    """
     with open(filename, 'r') as file:
         return file.read()
 
-def walk_directory(directory):
-    image_extensions = ['.png', '.jpg', '.jpeg', '.gif', '.bmp', '.svg', '.ico', '.tif', '.tiff']
+def walk_directory(directory: str) -> Dict[str, str]:
+    """
+    Walks through a directory and returns a dictionary with the relative file path
+    and its content. Only non-blob files are included.
+    """
     code_contents = {}
     for dirpath, _, filenames in os.walk(directory):
         for filename in filenames:
-            if not any(filename.endswith(ext) for ext in image_extensions):
+            if not any(filename.endswith(ext) for ext in BLOB_EXTENSIONS):
+                relative_filepath = os.path.relpath(os.path.join(dirpath, filename), directory)
                 try:
-                    relative_filepath = os.path.relpath(os.path.join(dirpath, filename), directory)
                     code_contents[relative_filepath] = read_file(os.path.join(dirpath, filename))
                 except Exception as e:
-                    code_contents[relative_filepath] = f"Error reading file {filename}: {str(e)}"
+                    code_contents[relative_filepath] = f"Error reading file {filename}: {e}"
     return code_contents
 
+@MODAL.local_entrypoint()
+def main(prompt: str, directory=GENERATED_DIR, model="gpt-3.5-turbo"):
+    """
+    Main function to debug a program for a user based on their file system.
+    """
+    code_contents = walk_directory(directory)
 
+    context = "\n".join(f"{path}:\n{contents}" for path, contents in code_contents.items())
+    system_prompt = "You are an AI debugger who is trying to debug a program for a user based on their file system. The user has provided you with the following files and their contents, finally followed by the error message or issue they are facing."
+    user_prompt = f"My files are as follows: {context}\n\nMy issue is as follows: {prompt}\n\nGive me ideas for what could be wrong and what fixes to do in which files."
 
-@stub.local_entrypoint()
-def main(prompt, directory=generatedDir, model="gpt-3.5-turbo"):
-  code_contents = walk_directory(directory)
-
-  # Now, `code_contents` is a dictionary that contains the content of all your non-image files
-  # You can send this to OpenAI's text-davinci-003 for help
+    res = generate_response.call(system_prompt, user_prompt, model)
 
-  context = "\n".join(f"{path}:\n{contents}" for path, contents in code_contents.items())
-  system = "You are an AI debugger who is trying to debug a program for a user based on their file system. The user has provided you with the following files and their contents, finally folllowed by the error message or issue they are facing."
-  prompt = "My files are as follows: " + context + "\n\n" + "My issue is as follows: " + prompt
-  prompt += "\n\nGive me ideas for what could be wrong and what fixes to do in which files."
-  res = generate_response.call(system, prompt, model)
-  # print res in teal
-  print("\033[96m" + res + "\033[0m")
+    # Print response in teal
+    print(f"\033[96m{res}\033[0m")
 
-
-@stub.function(
-    image=openai_image,
+@MODAL.function(
+    image=OPENAI_IMAGE,
     secret=modal.Secret.from_dotenv(),
     retries=modal.Retries(
         max_retries=3,
@@ -53,16 +58,19 @@ def main(prompt, directory=generatedDir, model="gpt-3.5-turbo"):
     concurrency_limit=5,
     timeout=120,
 )
-def generate_response(system_prompt, user_prompt, model="gpt-3.5-turbo", *args):
+def generate_response(system_prompt: str, user_prompt: str, model="gpt-3.5-turbo", *args) -> str:
+    """
+    Generates a response from OpenAI's API based on the system and user prompts.
+    """
     import openai
 
     # Set up your OpenAI API credentials
-    openai.api_key = os.environ["OPENAI_API_KEY"]
+    openai.api_key = os.getenv("OPENAI_API_KEY")
 
     messages = []
     messages.append({"role": "system", "content": system_prompt})
     messages.append({"role": "user", "content": user_prompt})
-    # loop thru each arg and add it to messages alternating role between "assistant" and "user"
+
     role = "assistant"
     for value in args:
         messages.append({"role": role, "content": value})
@@ -70,7 +78,6 @@ def generate_response(system_prompt, user_prompt, model="gpt-3.5-turbo", *args):
 
     params = {
         'model': model,
-        # "model": "gpt-4",
         "messages": messages,
         "max_tokens": 1500,
         "temperature": 0,
@@ -81,4 +88,4 @@ def generate_response(system_prompt, user_prompt, model="gpt-3.5-turbo", *args):
 
     # Get the reply from the API response
     reply = response.choices[0]["message"]["content"]
-    return reply
\ No newline at end of file
+    return reply