#include <stdio.h>

void strcpys(char *s, char *t);
int main() {
    char *ms;
    char *mt;

    mt = "ABCDEFGAAA,AAAAA";
    strcpys(ms, mt);
    printf("%sn", ms);
    printf("%sn", mt);
    return 0;
}

void strcpys(char *s, char *t) {
    while ((*s = *t) != '') {
        s++;
        t++;
    }
}