input: Write a python function to calculate the circumference of a circle given its radius.
  assert calc_circle_circumference(4) == 25.12
  assert calc_circle_circumference(0) == 0
  assert calc_circle_circumference(7) == 43.96
output: def calc_circle_circumference(radius):
      return round(2 * 3.14 * radius, 2)