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;
    uint16_t mask1 = 0x01;
    uint8_t  mask2 = 0x01;
    for(int cnt = 0; cnt < 8; cnt++)
    {
        if(val & mask1) res |= mask2;
        mask1 <<= 2;
        mask2 <<= 1;
    }
    return res;
}

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

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

Solving Approach