Extract Even Bits Only from 32-bit Register

Simple Answer

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

uint32_t extract_even_bits(uint32_t reg) {
    // Your code here
    uint32_t val = 0;
    while(reg!=0)
    {
        val <<= 1;
        val = (val | (reg&1));
        reg >>= 2;
    }
    return val;
}

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

Solving Approach