input: Write a function to calculate the square root of a given positive number. If the input number is negative, the function should return an error message indicating that the input is invalid.
  assert calculate_square_root(100)==10.0
  assert calculate_square_root(25)==5.0
  assert calculate_square_root(9)==3.0
  assert calculate_square_root(-1)=="Invalid input: Negative numbers are not allowed"
  assert calculate_square_root(0)==0.0
output: def calculate_square_root(number):
      if number < 0:
          return "Invalid input: Negative numbers are not allowed"
      return number ** 0.5