Bit Spreading Interleave Bits with Zeros

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

uint16_t output;
uint16_t spread_bits(uint8_t val) {
    // Your logic here
    for (int i = 0; i < 8; ++i){
        uint8_t bit = 0;
        bit = (val >> i) & 1u;
        if (bit == 1){output |= ((uint16_t)1u << (2*i));}
    }
    return output;
}

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

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