Keep Only the Highest Set Bit

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

// Complete the function
uint16_t highest_set_bit(uint16_t reg) {
    if(reg==0){return 0;}
    reg=reg|(reg>>1);
    reg=reg|(reg>>2);
    reg=reg|(reg>>4);
    reg=reg|(reg>>8);
    uint32_t temp=reg;
    temp=temp+1;
    temp=temp>>1;
    reg=(uint16_t)temp;
    return reg;
}

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

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