input: Write a Python function that takes a string of words omitted by commas or spaces, and converts it into a list of individual words.
  assert split_string("Hi, my name is John") == ["Hi", "my", "name", "is", "John"]
  assert split_string("One, two, three, four, five, six") == ["One", "two", "three", "four", "five", "six"]
  assert split_string("Hi, my name") == ["Hi", "my", "name"]
  assert split_string("One,, two, three, four, five, six,") == ["One", "two", "three", "four", "five", "six"]
  assert split_string("") == []
  assert split_string("ahmed     , gamal") == ["ahmed", "gamal"]
output: def split_string(s):
      import re
      return list(filter(None, re.split(r'[,\s]+', s)))