input: def query_customer_data(name: str) -> str:
      """
      This function takes a customer name as input and searches for the corresponding customer data in the database. It returns the customer's data as a string.
      >>> query_customer_data('John Doe')
      'Name: John Doe, Total Purchases: $5000'
      >>> query_customer_data('Jane Smith')
      'Name: Jane Smith, Total Purchases: $3200'
      """
output:     customer_data = {
          'John Doe': 'Name: John Doe, Total Purchases: $5000',
          'Jane Smith': 'Name: Jane Smith, Total Purchases: $3200'
      }
      return customer_data.get(name, 'Customer not found')