24. Keep Only the Highest Set Bit

You are given a 16-bit register (uint16_t).
Your task is to:

• Return a value where only the highest (leftmost) set bit is retained
• All other bits must be cleared

Example-1

Input:  44        // Binary: 0000000000101100  
Output: 32        // Binary: 0000000000100000

Example-2

Input:  512       // Binary: 0000001000000000  
Output: 512       // Binary: 0000001000000000

Example-3

Input:  255       // Binary: 0000000011111111  
Output: 128       // Binary: 0000000010000000