Keep Only the Highest Set Bit

Code

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

// Complete the function
uint16_t highest_set_bit(uint16_t reg) {
    int highest_set_bit_pos = 0;
    int i=0;
    while ((i < 16)) {
        if (reg & (1U<<0) == 1) {
            highest_set_bit_pos = i;
        }
        reg = reg >> 1;
        i++;
    }

    if (highest_set_bit_pos > 0) 
        return (1U << highest_set_bit_pos);
    return 0;
}

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

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

Solving Approach