Bit Spreading Interleave Bits with Zeros

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

uint16_t spread_bits(uint8_t val) {
    // Your logic here
    # define CHECK_BIT(reg, pos) ((reg) & (1u << (pos)))
    # define SET_BIT(reg, pos) ((reg) |= (1U << (pos)))
    uint16_t res = 0;
    for (int i = 0; i < 8; i++){
        if (CHECK_BIT(val, i)){
            SET_BIT(res, i * 2);
        }
    }
    return res;
}

int main() {
    uint8_t val;
    scanf("%hhu", &val);

    uint16_t result = spread_bits(val);
    printf("%u", result);
    return 0;
}