Bit Spreading Interleave Bits with Zeros

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

uint16_t spread_bits(uint8_t val) {
    uint16_t reg =0;
    bool temp;
    for(int8_t i= 7; i>=0; i--)
    {
        temp = val &(1<<i);
        if(temp)
            reg |=  (1<<(2*i));
    }
    // Your logic here
    return reg;
}

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

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