Bit Spreading Interleave Bits with Zeros

Code

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

uint16_t spread_bits(uint8_t val) 
{
    uint8_t index = 0;
    uint16_t res = 0;
    for ( ; index < 8; index++)
    {
        uint8_t bit = 1 & (val >> index);
        res |= bit << (index * 2);
    }

    return res;
}

int main() {
    uint8_t val;
    scanf("%hhu", &val);

    uint16_t result = spread_bits(val);
    printf("%u", result);
    return 0;
}

Solving Approach