编写一个C语言程序，将两个字符串连接起来，不要用strcat函数

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

int main() {
char str1[100], str2[100];
int i, j;

printf("Enter the first string: ");
scanf("%s", str1);

printf("Enter the second string: ");
scanf("%s", str2);

i = strlen(str1);
for (j = 0; str2[j] != '\0'; i++, j++) {
str1[i] = str2[j];
}
str1[i] = '\0';

printf("Concatenated string is: %s\n", str1);

return 0;
}