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 reg;
    uint16_t MSK = 1 << 15;
    while((MSK & reg) == 0){
        MSK = MSK >> 1;
       // if(MSK == 0) return MSK;
    }
    return MSK|0;
    // Your logic here
}

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

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