Implemented parseTokenStream() in Tokenizer.java. This method will process a given string into a stream of tokens by dividing the string into substrings between occurrences of certain filter tokens. For example, this string 'make%fake' filtered with the tokens '$' and '%' would yield the token stream (a collection of strings) 'make', '$', 'cake', '%', 'fake'. This methods implementation was purpose-driven to assist in processing and parsing XML documents.