22. Extract Even Bits Only from 32-bit Register

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

uint32_t extract_even_bits(uint32_t reg) {
    // Your code here
    reg= reg & 0x55555555;
    reg =(reg|(reg>>1))&0x33333333;
    reg =(reg|(reg>>2))&0x0F0F0F0F;
    reg =(reg|(reg>>4))&0x00FF00FF;
    reg =(reg|(reg>>8))&0x0000FFFF;
    return reg;
}

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