Compress Interleaved Bits Reverse Bit Spreading

Code

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

#define GET_BIT(reg, pos)  ((reg >>pos)&1)
uint8_t compress_bits(uint16_t val) {
    uint8_t res , cnt = 0;
    
    for(int i = 0; i < 16; i+=2 )
    {
        res |= ((GET_BIT(val, i)) << cnt);
        cnt++;
    }
    return res;
}

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

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

Solving Approach