Extract Even Bits Only from 32-bit Register

Code

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

uint32_t extract_even_bits(uint32_t reg) {
    uint16_t res = 0;
    bool tempBit = 0;
    for (uint8_t i = 0; i< 16; i++)
    {
        tempBit = reg & (1<<2*i);
        res |= (tempBit<<i);
    }
    return res;
}

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

Solving Approach