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 <= 1) return reg;
    int n = 15;
    while (!(reg & (1 << n))){
        n--; //decrement n until we find the highest set bit
    }
    for (int i = n-1; i >= 0; i--){
        reg &= ~(1 << i); //clear all bits below that
    }
    return reg;
}

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

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