input: Write a function to calculate the total cost of a shopping cart. The function should consider the item prices, quantity, shipping cost, and any applicable taxes. It should take as input a list of dictionaries representing items in the cart, a shipping cost, and a tax rate. The function should return the total cost as a float.
  assert calculate_total_cost([{"name": "widget", "price": 10, "quantity": 5}, {"name": "thingy", "price": 7, "quantity": 3}, {"name": "doodad", "price": 5, "quantity": 2}], 7.50, 0.095) == 117.475
  assert calculate_total_cost([{"name": "book", "price": 15, "quantity": 2}, {"name": "pen", "price": 2, "quantity": 10}], 5.0, 0.08) == 55.6
  assert calculate_total_cost([], 0, 0) == 0
output: def calculate_total_cost(items, shipping_cost, tax_rate):
      subtotal = sum(item['price'] * item['quantity'] for item in items)
      total_cost = subtotal + shipping_cost
      total_cost += total_cost * tax_rate
      return total_cost