example.diff

diff --git a/example.py b/example.py
index 1234567..abcdefg 100644
--- a/example.py
+++ b/example.py
@@ -1,10 +1,15 @@
 import os
 import sys
+import json
+from typing import Dict, Any, Optional
 
-def hello_world():
-    print("Hello, World!")
+def hello_world(name: Optional[str] = None) -> str:
+    """
+    Returns a greeting message.
+    
+    Args:
+        name: Optional name to greet. If None, uses "World".
+    """
+    greeting = f"Hello, {name or 'World'}!"
+    return greeting
 
-if __name__ == "__main__":
-    hello_world()
-    print("Goodbye!")
+def save_greeting(name: Optional[str] = None, file_path: str = "greeting.json") -> Dict[str, Any]:
+    """
+    Saves a greeting to a JSON file.
+    
+    Args:
+        name: Optional name to greet
+        file_path: Path to save the greeting
+        
+    Returns:
+        Dictionary containing the greeting data
+    """
+    greeting = hello_world(name)
+    data = {
+        "greeting": greeting,
+        "timestamp": os.path.getmtime(file_path) if os.path.exists(file_path) else None
+    }
+    
+    with open(file_path, "w") as f:
+        json.dump(data, f)
+    
+    return data
+
+if __name__ == "__main__":
+    name = sys.argv[1] if len(sys.argv) > 1 else None
+    result = save_greeting(name)
+    print(result["greeting"])