Zach_1-12

#define IN 1
#define OUT 0

int main() {
    int state = IN;
    int c, counter = 0;

    while ((c = getchar()) != EOF) {
        if (c == ' ' || c == '\n' || c == '\t') {
            state = OUT;
            ++counter;
        }
        if (state == IN) {
            putchar(c);
            counter = 0;
        } else {
            state = IN;
            if (counter == 1)
                printf("\n");
        }
    }

    return 0;
}