char* reverse_sub(char* str, int start, int end) {
    while (start < end) {
        swap(str + start++, str + end--);
    }
    return str;
}

char* reverse(char* str) {
    return reverse_sub(str, 0, strlen(str) - 1);
}

int ch_str(char* str, char ch) {
    int i = 0;
    while (str[i]) {
        if (str[i] == ch) {
            return i;
        }
        i++;
    }
    return -1;
}

int words_count(char* str) {
    char sep[] = "., ()!?\n\t";
    int i = 0, count = 0, in_word = 1;
    while (str[i]) {
        if (ch_str(sep, str[i]) != -1) {
            if (in_word) {
                count++;
                in_word = 0;
            }
        }
        else {
            in_word = 1;
        }
        i++;
    }//hello world\0
    if (in_word) {
        count++;
    }
    return count;
}

int longest(char* str) {
    char sep[] = "., ()!?\n\t";
    int i = 0, max_len = 0, current = 0, in_word = 1;
    while (str[i]) {
        if (ch_str(sep, str[i]) != -1) {
            if (in_word) {
                if (current > max_len) {
                    max_len = current;
                }
                current = 0;
                in_word = 0;
            }
        }
        else {
            current++;
            in_word = 1;
        }
        i++;
    }
    if (in_word) {
        if (current > max_len) {
            max_len = current;
        }
    }
    return max_len;
}

int shortest(char* str) {
    char sep[] = "., ()!?\n\t";
    int i = 0, min_len = INT_MAX, current = 0, in_word = 1;
    while (str[i]) {
        if (ch_str(sep, str[i]) != -1) {
            if (in_word) {
                if (current < min_len) {
                    min_len = current;
                }
                current = 0;
                in_word = 0;
            }
        }
        else {
            current++;
            in_word = 1;
        }
        i++;
    }
    if (in_word) {
        if (current < min_len) {
            min_len = current;
        }
    }
    return min_len;
}

void print_words(char* str) {
    char sep[] = "., ()!?\n\t";
    int i = 0, in_word = 1;
    while (str[i]) {
        if (ch_str(sep, str[i]) != -1) {
            if (in_word) {
                putchar('\n');
                in_word = 0;
            }
        }
        else {
            putchar(str[i]);
            in_word = 1;
        }
        i++;
    }
    if (in_word) {
        putchar('\n');
    }
    return;
}
char* reverse_words(char* str) {
    char sep[] = "., ()!?\n\t";
    int i = 0, in_word = 1, start = 0;
    while (str[i]) {
        if (ch_str(sep, str[i]) != -1) {
            if (in_word) {
                reverse_sub(str, start, i - 1);
                in_word = 0;
            }
        }
        else {
            if (!in_word) {
                start = i;
            }
            in_word = 1;
        }
        i++;
    }
    if (in_word) {
        reverse_sub(str, start, i - 1);
    }
    return str;
}