#include <stdio.h>
char *strcopy(char* dest,char *src){
if(dest==NULL||src==NULL)return NULL;
if(dest==src)return dest;
char *out=dest;
while(*dest++=*src++);
return out;
}
int main () {
char a[]="abcde";
strcopy(a," 2");
printf("%s\n",a);
printf("%d\n",strlen(a));
return 0;
}