input: def calculate_square_root(n: float) -> float:
      """ Calculate the square root of a given positive number.
      >>> calculate_square_root(100)
      10.0
      >>> calculate_square_root(25)
      5.0
      """
      import math
      return math.sqrt(n)
output:     if n < 0:
          raise ValueError("Input must be a non-negative number")