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
    int n = 15; 
    uint16_t test =1<<n;
    int i =1;
    while (i<15){
        if ((reg & test)==0){
        test = 1<<(n-i);
        i = i+1;
        }
        else{
            return test;
        }
    }
    
    return 0;
}

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

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

Solving Approach