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strsep - extract token from string
#include <string.h> char *strsep(char **stringp, const char *delim);
The strsep() function returns the next token from the string stringp which is delimited by delim. The token is terminated with a `\0' character and stringp is updated to point past the token.
The strsep() function returns a pointer to the token, or NULL if delim is not found in stringp.
The strsep() function was introduced as a replacement for strtok(), since the latter cannot handle empty fields. (However, strtok() conforms to ANSI-C and hence is more portable.)