Parse GPS String for Time and Coordinates

#include <stdio.h>
#include <string.h>

void parse_gprmc(char *str) {
    char *fields[7];
    int idx = 0;

    fields[idx++] = str;

    // Split manually at commas
    for (char *p = str; *p && idx < 7; p++) {
        if (*p == ',') {
            *p = '\0';
            fields[idx++] = p + 1;
        }
    }

    char *time = fields[1];

    printf("Time: %.2s:%.2s:%.2s\n", time, time + 2, time + 4);
    printf("Latitude: %s %s\n", fields[3], fields[4]);
    printf("Longitude: %s %s\n", fields[5], fields[6]);
}

int main() {
    char nmea[100];
    fgets(nmea, sizeof(nmea), stdin);
    parse_gprmc(nmea);
    return 0;
}