Compress Interleaved Bits Reverse Bit Spreading

Code

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

uint8_t compress_bits(uint16_t val) {
    // Your logic here
    uint8_t res = 0;
    uint8_t mask = (1U << 7);
    for(int i=0; i<8; i++)
    {
        res >>= 1;
        if(val & 1U)
        {
            res |= mask;
            val >>= 2;
        }
        else
        {
            val >>= 2;
        }
    }

    return res;
}

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

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

Solving Approach