input: Write a function to find the largest three numbers in a list. The function should return a list containing the largest three numbers in descending order.
  assert find_largest_three([1, 6, 3, 8, 7, 4])==[8, 7, 6]
  assert find_largest_three([5, 3, 2, 8, 10, 6])==[10, 8, 6]
  assert find_largest_three([1, 2, 3, 4, 5])==[5, 4, 3]
  assert find_largest_three([7, 7, 7, 7])==[7, 7, 7]
  assert find_largest_three([])==[]
output: def find_largest_three(nums):
      if len(nums) == 0:
          return []
      largest_three = sorted(nums, reverse=True)[:3]
      return largest_three