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

int main (){
	char chuoi1 [100];
	char chuoi2 [100];
	printf ("\n Nhap chuoi 1: ");
	gets (chuoi1);
	printf ("\n Nhap chuoi 2: ");
	gets (chuoi2);

	CopyString(chuoi1, strlen(chuoi1), chuoi2, strlen(chuoi2));
}

void CopyString(char* s1, int s1_size, char* s2, int s2_size)
{
    for (int i = 0; i <= s2_size; ++i)
    {
        s1[i] = s2[i];
    }

}