Bit Spreading Interleave Bits with Zeros

Code

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

#define bitx_get(reg, pos) ((reg >> pos) & 1u)
#define bitx_set(val, pos) ((val & 1u) << pos)
#define bitx_clear(pos) ~(1 << pos)

uint16_t spread_bits(uint8_t val) {
    // Your logic here
    uint16_t res;
    for (int i = 0; i < 16; i+=2) {
        res |= bitx_set(bitx_get(val, i / 2), i);
        res &= bitx_clear(i + 1);
    }
    return res;
}

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

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

Solving Approach