Bit Spreading Interleave Bits with Zeros

Code

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

#define SHIFT(n) (1 << n)

uint16_t spread_bits(uint8_t val) {
    uint16_t output = 0;  
    int acc = 0; 
    for (int i = 0; i < 8; i++)
        if(val & SHIFT(i)){ 
            output |= (SHIFT(i *2));
        }
    return output;
}

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

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

Solving Approach