Compress Interleaved Bits Reverse Bit Spreading

Code

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

uint8_t compress_bits(uint16_t val) {
    uint16_t m0 = 0x1;
    uint8_t m1 = 0x1;
    uint8_t ret = 0;
    int i = 0;

    while (i++ < 8) {
        if (val & m0)
            ret |= m1;
        m0 <<= 2;
        m1 <<= 1;
    }

    return ret;
}

int main() {
    uint16_t val;
    scanf("%hu", &val);

    uint8_t result = compress_bits(val);
    printf("%u", result);
    return 0;
}

Solving Approach