$[11$ points$]$ Write a function in C$++$ that reverses the characters in a string. The function prototype should look like the following, where the input string is str$2$ and the output string, i$.$e$.,$ the reverse copy of str$2,$ is str$1.($Hint: This can be considered as a string copy starting from the back end of str$2.)$

void strcpyr$($char str$1[],$ char str$2[])$;