不调用字符串库函数，实现字符串复制函数

#include<stdio.h>#include<stdlib.h>#include<assert.h>void stringcpy(char *to,const char *from){assert(to != NULL && from != NULL);while(*from != '\0')*to++ = *from++;*to = '\0';}int main(){char *f;char *t;f = (char *)malloc(15);t = (char *)malloc(15);stringcpy(f,"123456");stringcpy(t,f);printf("t=%s\n",t);return 0;}