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. The function should take a list of items, the shipping cost, and the tax rate as inputs and return the total cost.
  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) == 107.6
  assert calculate_total_cost([{"name": "laptop", "price": 1000, "quantity": 1 }], 15.00, 0.1) == 1115.0
  assert calculate_total_cost([{"name": "book", "price": 20, "quantity": 2 }, {"name": "pen", "price": 2, "quantity": 10 }], 5.00, 0.0) == 65.0
  assert calculate_total_cost([], 0.00, 0.0) == 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