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
    uint16_t index = 0;
    uint8_t i = 0;
    for (i = 0; i < 16; i++){
        if((reg >> i) & 0x1){
            index = i;
        }
    }
    reg &= ~(0xFFFF);
    return (index == 0) ? reg &= ~(0xFFFF) : reg |= (1 << index);
}

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

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

Solving Approach