Compress Interleaved Bits Reverse Bit Spreading

Code

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

uint8_t compress_bits(uint16_t val) {
    // Your logic here
    int index = 0;
    uint8_t res  = 0;
    for(int i  = 0 ;i < 15; i+= 2){
        res = res | (((val >> i) & 1) << index);
        index ++;
    }
    return res;
}

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

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

Solving Approach