input: Write a function to calculate the total cost of a shopping cart considering 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) == 100.1125
  assert calculate_total_cost([{"name": "apple", "price": 1, "quantity": 10}, {"name": "banana", "price": 0.5, "quantity": 15}], 5.00, 0.08) == 25.4
  assert calculate_total_cost([{"name": "pen", "price": 2, "quantity": 10}], 3.50, 0.1) == 25.5
  assert calculate_total_cost([], 5.00, 0.08) == 5.4
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