Write a function to find the length of the string, input the string in the main function, and output its length

#include<stdio.h>
#include<string.h>

void nixu(char* num);

int main(void)
{
    
    
	char num[100];
	printf("请输入字符串：");
	gets_s(num);
	nixu(num);
	return 0;
}

void nixu(char* num)
{
    
    
	int i;
	i = strlen(num);
	printf("长度为%d", i);
}