22. Extract Even Bits Only from 32-bit Register

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

uint32_t extract_even_bits(uint32_t reg) {
    uint32_t new_reg;
    int pos = 0;
    while(reg) {
        uint32_t bit = (reg & 1U);
        new_reg |= bit<<pos;
        pos++;
        reg >>= 2;
    }
    return new_reg;
}

int main() {
    uint32_t reg;
    scanf("%u", &reg);
    printf("%u", extract_even_bits(reg));
    return 0;
}