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;
    
    uint16_t highest_bit = 1 << 15;
    
    while ((highest_bit & reg) == 0) {
        highest_bit >>= 1;
    }
    
    return highest_bit;
}

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

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