Compress Interleaved Bits Reverse Bit Spreading

Code

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

uint8_t compress_bits(uint16_t val) {
    uint8_t reg;
    int j=0;
    for(int i=0;i<16;i=i+2)
    {
        if((val &(1<<i))!=0)
        reg|=(1<<j);
        else
         reg&=~(1<<j);

     j++;
    }
    return reg;
}

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

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

Solving Approach