Keep Only the Highest Set Bit

Code

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

// Complete the function
uint16_t highest_set_bit(uint16_t reg) {
    uint16_t previous = 0;

    if( (reg > 0) && ((reg & (reg - 1)) == 0)){
        return reg;
    }
    else{
        while(true){
            reg &= (reg - 1);

            if(!reg){
                break;
            }
            previous = reg;
        }
        return previous & 0xffff;
    }

   
}

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

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

Solving Approach