strsep - extract token from string
*stringp is NULL, the strsep() function returns NULL and does nothing else. Otherwise, this function finds the first token in the string
*stringp, that is delimited by one of the bytes in the string
delim. This token is terminated by overwriting the delimiter with a null byte ('\0'), and
*stringp is updated to point past the token. In case no delimiter was found, the token is taken to be the entire string
*stringp is made NULL.
The strsep() function returns a pointer to the token, that is, it returns the original value of
Be cautious when using this function. If you do use it, note that:
This function modifies its first argument.
This function cannot be used on constant strings.
The identity of the delimiting character is lost.
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