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<>strcpy 覆盖拷贝
*
被拷贝的字符串必须以’\0’结束。
*
目标空间要足够大，至少要能放的下拷贝的东西。
*
目标空间的值是可以修改，比如常量区的字符串，不能够修改，就不能使用。
*
会将被拷贝的字符串中的’\0’拷贝到目标空间。
*
函数实现。
方法一
char* my_strcpy(char* dst, const char* src) { const ret = dst; while (*src) {
*dst = *src; dst++; src++; } *dst = '\0'; return ret; }
ret记录字符串的首地址，将函数的返回值设置成为一个char*，是为了在调用函数的时候可以像my_strcpy(str1,
my_strcpy(str1, p1));这样嵌套，由于strcpy拷贝是拷贝’\0’的，因此在最后，我们需要吧*dst最后所指向的内容改为’\0’。
方法二
char* my_strcpy(char* dst, const char* src) { const ret = dst;
//先赋值，再判断，只要不是\0，代码就继续 while (*dst++ = *src++); return ret; }
方法二就相对方法一进行了简化，采用前置++的方式，前置++的优先级高于*，因此没循环一次，指针向后移一下，再将src的值赋给dst。
