Keep Only the Highest Set Bit

Code

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

// Complete the function
uint16_t highest_set_bit(uint16_t reg) {
    // Your logic here
    if (reg == 0) return 0;
    for(int i=15; i>=0; i--){
        if(reg & (1U << i)){
            reg = 0x00;
            reg |= ( 1U << i);
            return reg;
        }
    }
    return 0;;
}

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

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

Solving Approach