input: Write a function to take a list of numbers from 1 to 8 and return a new list containing their cubic values. If the input list is empty, return an empty list.
  
  assert calculate_cubics([1, 2, 3, 4, 5, 6, 7, 8])==[1, 8, 27, 64, 125, 216, 343, 512]
  assert calculate_cubics([])==[]
output: def calculate_cubics(numbers):
      return [x**3 for x in numbers]