Bit Spreading Interleave Bits with Zeros

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

uint16_t spread_bits(uint8_t val) //val=255
{
    uint16_t rez=0;
    uint8_t mask=1;
    for(int i=0;i<8;i++)
    {
        if(val&(mask<<i))
        rez= rez | (mask<<(2*i));
    }
    return rez;
}

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

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