main.c

int findLastSlash(const char *filepath, int len_filepath){
    int idx = 0;
    int location = -1;
    while(filepath[idx] != '\0' && idx < len_filepath){
        if(filepath[idx] == '\\' || filepath[idx] == '/'){
            location = idx;
        }
        idx++;
    }
    return location;
}

char * getBaseName(char *filepath, int len_filepath) {
    int location = findLastSlash(filepath, len_filepath);
    char *tmp;
    if(location > -1){
        location++;
        tmp = (char *) malloc((unsigned long)(len_filepath - location));
        int idx = 0;
        while(location < len_filepath && filepath[location] != '\0'){
            tmp[idx] = filepath[location];
            idx++;
            location++;
        }
        tmp[idx] = '\0';
        return tmp;
    }
    tmp = (char *) malloc((unsigned long)(len_filepath));
    strncpy(tmp, filepath, (unsigned long) len_filepath);
    return tmp;
}