Compress Interleaved Bits Reverse Bit Spreading

Code

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

uint8_t compress_bits(uint16_t val) {
    val &= 0x5555;
    uint8_t x = 0;
    for(int i = 0; i < 8;i++) {
        if(val & (1 << 2*i))
            x |= (1 << i);
    }
    return x;
}

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

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

Solving Approach