The realization of mystricpy???

#include <iostream>
using namespace Std;
char* mystrcpy (char* dest,char* src) {
Char* temp=dest;//assigns the address of the dest to Temp
while (*temp++=*src++);
Return dest;//returns a pointer? Why not use temp?
}
int main () {
Char ca[21];
cout<<mystrcpy (CA, "Hello,world") <<endl;
System ("pause");
}

Note the points:1. A pointer or reference constant in the function body cannot be returned.

2. Pointer variables in the function body do not automatically release as the function dies. If the memory space is created, the memory needs to be freed;

The realization of mystricpy???