Compress Interleaved Bits Reverse Bit Spreading

Extract one bit at a time and then using oring 

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

uint8_t compress_bits(uint16_t val) {
    // Your logic here
    uint8_t res;
    uint8_t i;
    for(i = 0; i<8; i++){
        res >>= 1;
        res |= (val & 1) << 7;
        val >>= 2;
    }
    /*
    for (int i = 0; i < 8; i++) {
        // Extract bit at position 2*i from val
        uint8_t bit = (val >> (2 * i)) & 1;

        // Place it at i-th bit position in result
        result |= (bit << i);
    }
    */
    return res;
}

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

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

Solving Approach