Compress Interleaved Bits Reverse Bit Spreading

Code

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

uint8_t compress_bits(uint16_t val) {
    
    uint8_t result = 0;
    uint8_t mask = 0;
    
    for (int i = 0 ; i < 8 ; i++){
        mask = ((val >> 2*i) & 1);
        result |=  mask << i;
    }

    return result;
}

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

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

Solving Approach