int word_count(const char *filename)
{
    FILE *f = fopen(filename, "r");
    if(!f) return -1;
    int counter = 0;
    char ch;
    char prev = '\0';
    int word;
    while((ch = fgetc(f)) != EOF) {
        if (isspace(ch) != 0 && isspace(prev) == 0) {
            counter++;
            word++;
        }
    }
    if(counter != 0) word++;
    return word;
}