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
    uint8_t i = 0;
    uint8_t index = 0;
    while(i < 16)
    {
        if(((reg << i) & 0x8000) == 0)
        {
            index++;
        }
        else break;
        i++;
    }
    
    return reg & (0x8000 >> index);
}

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

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

Solving Approach