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int words_3char(char *str){
    int i;
    int cnt = 0;
    int words = 0;

    for (i = 0; str[i] != '\0'; i++){
        if (str[i] != ' ' && str[i] != '\0'){
            cnt++;
        } else if (cnt == 3) {
            words++;
            cnt = 0;
        } else {
            cnt = 0;
        }
    }
    return words;
}