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 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, 9.5)==112.35
  assert calculate_total_cost([ 
   {"name": "widget", "price": 5, "quantity": 10 },
  ], 5.00, 8.0)==64.0
  assert calculate_total_cost([], 0.0, 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 / 100)
      return total_cost