input: Write a python function to calculate the future stock price over a given number of days considering the volatility.
  assert isinstance(calculate_price(100, 10, 5), float)
  assert isinstance(calculate_price(150, 20, 10), float)
  assert calculate_price(200, 0, 5) == 200
output: def calculate_price(current_price, volatility, days):
      import random
      future_price = current_price
      for _ in range(days):
          daily_change = random.uniform(-volatility, volatility)
          future_price += future_price * (daily_change / 100)
      return future_price