C++ sample interview question string copy function

#include<iostream>
using namespace std;
//String copy function
char * sCpy(char *strDest, char *strSource)
{
    _ASSERT((strDest != NULL) && (strSource!=NULL));
    char *d = strDest;              //Gets the current position of dest
    char *s = strSource;            //Gets the current location of the source
    while ((*d++ = *s++) != '0')   //Loop until you reach the last digit
    {
    }
    *d = '0';                      //Make up the last bit
    return strDest;
}
int main()
{
    char *strSource = "hello,world";
    char *strDest = new char[strlen(strSource)+1];      //Note that the return length of the strlen function does not include '0', so add 1
    _ASSERT(strDest != NULL);
    char *strReturn = sCpy(strDest,strSource);
    cout<<" Parameter returns a value "<<strDest<<endl;
    cout<<" Function return value "<<strReturn<<endl;
    //It should be ok not to release, the system will recover the resource after the main thread exits
    delete strSource,strDest,strReturn;
    strSource = strDest = strReturn = NULL;
    return 0;
}

The strcpy(str1,str2) function copies the contents of str2 to str1, why do you need the return value of the function? Should be convenient to implement chain expression, such as:

Int i_length = strlen (strcpy (str1, str2));