SIP request method

Challenge

A SIP request line looks like INVITE sip:bob@host SIP/2.0. Implement int sip_method(const char *line, char *out, int outsz) copying the first token (method) into out, returning its length, or -1 if there is no space.

Starter code

#include <string.h>

int sip_method(const char *line, char *out, int outsz) {
    /* TODO */
    return -1;
}