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
    // pos of highest set bit]
    uint16_t pos = 0;
    
    while (reg > 0) {
        reg = reg >> 1;
        pos++;
    } 
    // uint16_t mask = ((1U << pos) - 1);
    // reg = reg & ~(mask);

    return ((1U << (pos-1)));
}

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

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