input: Write a python function to calculate the total cost of a product purchase given the product name, quantity, and price.
  assert calculate_total_cost("Powerbank", 3, 15) == 45
  assert calculate_total_cost("Laptop", 2, 500) == 1000
  assert calculate_total_cost("Notebook", 10, 1.5) == 15
output: def calculate_total_cost(product_name, quantity, price):
      return quantity * price