>>267
#include <stdio.h>

char *my_strcpy(char *s1, char *s2)
{
int i = 0;
while (s1[i] != '\0' && s2[i] != '\0'){
s1[i] = s2[i];
i++;
}
s1[i] = '\0';
return s1;
}

int main()
{
char s1[] = "abc";
char s2[] = "wxyz";
my_strcpy(s1, s2);
printf("s1:%s s2:%s \n", s1, s2);
return 0;
}