- import std.typecons;
  import std.math;
  /*
- 
-     You will be given a string of words separated by commas or spaces. Your task is
? ----

+ You will be given a string of words separated by commas or spaces. Your task is
-     to split the string into words and return an array of the words.
? ----

+ to split the string into words and return an array of the words.
-     
-     For example:
? ----

+ For example:
-     >>> words_string("Hi, my name is John")
? ----

+ >>> words_string("Hi, my name is John")
-     ["Hi", "my", "name", "is", "John"]
? ----

+ ["Hi", "my", "name", "is", "John"]
-     >>> words_string("One, two, three, four, five, six")
? ----

+ >>> words_string("One, two, three, four, five, six")
-     ["One", "two", "three", "four", "five", "six"]
? ----

+ ["One", "two", "three", "four", "five", "six"]
-     
  */
  string[] words_string(string s)