Keep Only the Highest Set Bit

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

// Complete the function
uint16_t highest_set_bit(uint16_t reg) {
    uint16_t mask=0x8000;
    for(int i=15; i>=0;i--)
    {
        if((mask&reg))
        {
            reg &= (1<<i);
            break;
        }
        else
        {
            mask = (mask>>1);
        }
    }
    return reg;
}

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

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