This character in the original
string newstring is overwritten by a null character, and the pointer to the beginning
of the token in newstring is returned.
Return Value
All of these functions return a pointer to the next token found in strToken. They return NULL when no more tokens are found. Each call modifies strToken by substituting a NULL character for each delimiter that is encountered.
Remarks
The strtok function finds the next token in strToken. The set of characters in strDelimit specifies possible delimiters of the token to be found in strToken on the current call. wcstok is the wide-character version of strtok. The arguments and return value of wcstok are wide-character strings. These two functions behave identically otherwise.