You are given a 32-bit control register. Clear a group of bits (set them to 0) starting at a given position and length.
Other bits must stay untouched.
Example 1
Input: reg = 0b1111 1111, pos = 4, len = 4
Output: 0b0000 1111
Example 2
Input: reg = 0b0000 1111, pos = 0, len = 2
Output: 0b0000 1100
Input
255 4 4
Expected Output
15