input: Write a function to print the length of a given string.
  assert calc_length("Python")==None
  assert calc_length("Programming")==None
  assert calc_length("Language")==None
  assert calc_length("")==None
  
  def calc_length(s):
      print("Length of the given string is:", len(s))
output: def calc_length(s):
      print("Length of the given string is:", len(s))