Keep Only the Highest Set Bit

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

// Complete the function
    uint16_t highest_set_bit(uint16_t reg) {
        reg|=reg>>1;
        reg|=reg>>2;
        reg|=reg>>4;
        reg|=reg>>8;
        return reg&~(reg>>1);
    }

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

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