input: from typing import Dict
  
  def get_customer_data(name: str, customer_database: Dict[str, str]) -> str:
      """
      Given a customer name and a dictionary containing customer data, return the associated customer data.
      If the name is not found in the database, return "Customer not found."
      
      >>> get_customer_data("Alice", {"Alice": "Data of Alice", "Bob": "Data of Bob"})
      'Data of Alice'
      >>> get_customer_data("Charlie", {"Alice": "Data of Alice", "Bob": "Data of Bob"})
      'Customer not found.'
      >>> get_customer_data("Bob", {})
      'Customer not found.'
      """
      return customer_database.get(name, "Customer not found.")
output:     return customer_database.get(name, "Customer not found.")