input: def create_customer_search_app():
      """
      Create a command-line application in Python that stores customer data and allows customers to query by customer name.
      The script should accept a single argument representing the customer name, search for the customer, and print the results.
  
      Example:
      $ python customer_search_app.py JohnDoe
      Name: John Doe
      Address: 123 Street
      Phone: 555-555-5555
  
      If no customer name is specified, the app should print an error message.
      """
output:     import sys
      from typing import Dict, List
  
      customers: Dict[str, Dict[str, str]] = {
          "JohnDoe": {
              "Name": "John Doe",
              "Address": "123 Street",
              "Phone": "555-555-5555"
          },
          "JaneDoe": {
              "Name": "Jane Doe",
              "Address": "456 Avenue",
              "Phone": "555-555-5556"
          }
      }
  
      def search_customer(name: str) -> None:
          if name in customers:
              customer = customers[name]
              for key, value in customer.items():
                  print(f"{key}: {value}")
          else:
              print(f"Customer '{name}' not found.")
  
      if __name__ == "__main__":
          if len(sys.argv) < 2:
              print("Error: No customer name specified.")
          else:
              search_customer(sys.argv[1])