input: from typing import List
  
  def print_customer_data(name: str) -> None:
      """ Searches customer data by customer name and prints the results.
      If customer is found, prints the customer's details.
      If customer is not found, prints "Customer not found."
      
      >>> print_customer_data("John Doe")
      Name: John Doe, Address: 123 Maple St, City: Springfield
      
      >>> print_customer_data("Jane Smith")
      Customer not found.
      """
output:     customer_data = {
          "John Doe": {"Address": "123 Maple St", "City": "Springfield"},
          "Alice Johnson": {"Address": "456 Oak Ave", "City": "Shelbyville"}
      }
      
      if name in customer_data:
          details = customer_data[name]
          print(f"Name: {name}, Address: {details['Address']}, City: {details['City']}")
      else:
          print("Customer not found.")