求解C++的一道有关于string的题（英文）

求解C++的一道有关于string的题（英文）
Write a recursive function that display string reversly on the console using the following header:

void reverseDisplay(const char * const s)

For example, reverse("abcd") displays "dcba".


提示
The variable s is a c-string, the same as char s[].
To get the length of the string s, you can 1) use the library function strlen(), or 2) write a code to determine the length by yourself.
Please remember to include is you want use c-string library functions like strlen.