input: Write a python function to find the minimum and maximum stock prices.
  assert min_max_stock_price([9, 15, 7, 8, 13, 5]) == [5, 15]
  assert min_max_stock_price([12, 4, 8, 10, 6]) == [4, 12]
  assert min_max_stock_price([20, 35, 15, 25, 30]) == [15, 35]
output: def min_max_stock_price(prices):
      return [min(prices), max(prices)]