自定义函数完成字符串的复制功能，并编写主函数来测试?

Question

自定义函数（函数为：char stringcpy(char*to,char*from)）完成字符串的复制功能，并编写主函数来测试

Answer 1

char *stringcpy(char *to,char *from)
{
int i = 0;
while(to[i] = from[i])
i++;
return to;
}

Answer 2

#include "stdio.h"
char *stringcpy(char *to,char *from)
{
int i;
for(i=0;from[i];i++)
to[i]=from[i];
to[i]=0;
return to;
}
main()
{
char *s1="abc",*s2="abcdefg";
stringcpy(s1,s2);
puts(s1);
}