10. Set Multiple Bits in 8-bit Register

You are given an 8-bit register. Set all bits between position start and end (inclusive).

Use 0-based indexing and assume start <= end.

Example 1

Input: reg = 0b00000000, start = 1, end = 3 
Output: 0b00001110

Example 2

Input: reg = 0b00001000, start = 0, end = 2 
Output: 0b00001111

Example 3

Input: reg = 0b00000001, start = 3, end = 5 
Output: 0b00111001