Bit Spreading Interleave Bits with Zeros

Extract and shift and or with prev res

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

uint16_t spread_bits(uint8_t val) {
    // Your logic here
    bool b;
    char i = 0;
    uint16_t res = 0;
    while(i<8){
        b = (val >> i) & 1U;
        res |= (b << (2*i));
        i++;
    }
    return res;
}

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

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

Solving Approach

Extract the relevant bit and shift it by the position and then or back into the previous result.