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
    if (!reg){
        return 0;
    }
    uint16_t reg_copy = reg;
    uint16_t len = 15;
    while (!(reg_copy & (1 << 15))){
        reg_copy = reg_copy << 1;
        len--;
    }
    return (1 << len);
}

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

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

Solving Approach