Keep Only the Highest Set Bit

#include <stdio.h>
#include <stdint.h>

// Complete the function
uint16_t highest_set_bit(uint16_t reg) {
    // Your logic here
    if (reg == 0)
    return 0;

    //Spread the highest bit to the right using a loop and Shift distances: 1, 2, 4, 8 till 16 bits
    for (uint8_t shift = 1; shift < 16; shift <<= 1) 
    {
        // OR the value with itself shifted right by 'shift' bits
        reg |= (reg >> shift);  // propagates the highest set bit to the right
    }

    // isolate only the highest set bit and clear all bits except the leftmost
    return reg & ~(reg >> 1);

}

int main() {
    uint16_t reg;
    scanf("%hu", &reg);

    uint16_t result = highest_set_bit(reg);
    printf("%hu", result);
    return 0;
}