<commit_before>/* ֳ˻ 
 * Author: hx1997
 * Desc: ֳ˻ 
 */ 

#include <stdio.h>
#include <stdlib.h>

int find_digital_root(int num) {
	int lsig_digit = 0; 
	int product = 1;
	
	while (num) {
		lsig_digit = num % 10;
		if (lsig_digit) product *= lsig_digit;
		num /= 10;
	}
	
	if (product < 10)
		return product;
	else
		return find_digital_root(product);
}

int main(void) {
	int num;<commit_msg>Digital_root: Remove unnecessary include stdlib.h<commit_after>/* ֳ˻ 
 * Author: hx1997
 * Desc: ֳ˻ 
 */ 

#include <stdio.h>

int find_digital_root(int num) {
	int lsig_digit = 0; 
	int product = 1;
	
	while (num) {
		lsig_digit = num % 10;
		if (lsig_digit) product *= lsig_digit;
		num /= 10;
	}
	
	if (product < 10)
		return product;
	else
		return find_digital_root(product);
}

int main(void) {
	int num;
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