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 keep_track_of_bit = 0;
    if(reg == 0) return 0;
    for(int i = 0; i < 16; i++) {
        if(reg & (1ULL << i)) {
            keep_track_of_bit = i;
        }
    }
    reg = 0;
    reg |= (1ULL << keep_track_of_bit);
    return reg;
}

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

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

Solving Approach