18. Rotate Right in a 32-bit Register

You are given a 32-bit hardware register and a number n. Rotate the register to the right by n bits in a circular fashion.
The bits shifted out on the right should reappear on the left.

Example 1

Input: reg = 0b0000 0000 0000 0000 0000 0000 0000 1111,  n = 4 
Output: 0b1111 0000 0000 0000 0000 0000 0000 0000

Example 2 

Input: reg = 0b0000 0000 0000 0000 0000 0000 0000 0001, n = 1 
Output: 0b1000 0000 0000 0000 0000 0000 0000 0000

Example 3

Input: reg = 0b1000 0000 0000 0000 0000 0000 0000 0000, n = 2 
Output: 0b0010 0000 0000 0000 0000 0000 0000 0000