What's the difference between strcpy and stpcpy?

Question

While reading the man page for strcpy, I discovered the function stpcpy also exists. However, the only difference I could notice in the man page is

Answer 1

The other difference is the return value. From the man page: "The strcpy() and strncpy() functions return s1. The stpcpy() function returns a pointer to the terminating `\0' character of s1."