Bit Spreading Interleave Bits with Zeros

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

uint16_t spread_bits(uint8_t val) {
    // Your logic here
    uint16_t new_val = 0;
    size_t i = 7;
    while (1){
        uint16_t mask = 1<<i;
        if (val & mask) {
            new_val += mask<<i;
        }
        if (i == 0) {
            break;
        }
        i--;
    }
    return new_val;    
}

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

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