Parse GPS String for Time and Coordinates

Code

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

int seek_indx(char *str, int indx)
{
    while(str[indx] != ',')
    {
        indx++;
    }

    return indx;
}

void parse_time(char* str, int start, int end)
{
    //printf("parse time : start= %d, end= %d\n", start, end);
    char word[9];
    int str_indx = start;
    for(int i=0; i<9; i+=3)
    {
        //printf("i=%d\n", i);
        word[i] = str[str_indx++];
        word[i+1] = str[str_indx++];
        word[i+2] = (i+2 == 8) ? '\0' : ':';
    }
    printf("Time: %s\n", word);
}

void parse_coordinate(char* str, int start, int end, const char* coordinate, char direction)
{
    //printf("parse cordinate : start= %d, end= %d %s %c\n", start, end, coordinate, direction);
    char word[end - start + 4];
    int word_indx = 0;
    for(int i=start; i<=end; ++i)
    {
        word[word_indx++] = str[i];
       
    }

    word[word_indx++] = ' ';
    word[word_indx++] = direction;
    word[word_indx] = '\0';
    printf("%s: %s\n", coordinate, word);
}

void parse_gprmc(char *str) {
    // Your logic here
    int indx = 7;
    int time_start = indx;
    indx = seek_indx(str, indx);
    parse_time(str, time_start, indx-1);
    indx++;
    // skip A
    indx = seek_indx(str, indx);
    indx++;
    // parse latitude
    int latitude_start = indx;
    indx = seek_indx(str, indx);
    parse_coordinate(str, latitude_start, indx-1, "Latitude", str[indx+1]);
    indx++;
    // Skip direction
    indx = seek_indx(str, indx);
    indx++;
    // parse longitude
    int longitude_start = indx;
    indx = seek_indx(str, indx);
    parse_coordinate(str, longitude_start, indx-1, "Longitude", str[indx+1]);



    
}

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

Solving Approach