Keep Only the Highest Set Bit

Code

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

// Complete the function
uint16_t highest_set_bit(uint16_t n) {
    if(n==0){
        return 0;
    }
    int index=0;
    int count=0;
    while(n>0){
        if(n&1==1){
            index = count;
        }
        count++;
        n=n>>1;
    }
    uint16_t reg=0;
    reg|= (1<<index);
    return reg;
}

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

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

Solving Approach