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 index=0;
    for (int i= 15; i >= 0 ; i--){
        if (reg & (1<<i)) {
            index = i;
            break;
        }
    }
    if (index){
    reg &=~((1<<index+1)-1);
    reg |= 1<<index;
    return reg;
    } else 
    return 0;
}

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

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

Solving Approach