117. Convert Integer to String

#include <stdio.h>

void print_integer_as_string(int num) {
    char digits[11] = "0123456789";
    char buf[10];
    int idx = 0;

    if (num == 0) {
        putchar('0');
        return;
    }else if (num < 0) {
        putchar('-');
        putchar(' ');
        num *= -1;
    }

    while (num != 0) {
        buf[idx] = digits[num % 10];
        num /= 10;
        idx++;
    }

    for (int i = idx-1; i>=0; i--) {
        putchar(buf[i]);
        putchar(' ');
    }

}

int main() {
    int num;
    scanf("%d", &num);
    print_integer_as_string(num);
    return 0;
}