input: Write a function to calculate the square root of a user-defined positive number using the math module. If the input number is zero or negative, it should return an error message.
  assert calculate_square_root(100)=='Square root of 100 is 10.0'
  assert calculate_square_root(25)== 'Square root of 25 is 5.0'
  assert calculate_square_root(0)=='Error: The input must be a positive number'
  assert calculate_square_root(-1)=='Error: The input must be a positive number'
output: def calculate_square_root(num):
      if num <= 0:
          return 'Error: The input must be a positive number'
      return f'Square root of {num} is {math.sqrt(num)}'