Bit Spreading Interleave Bits with Zeros

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

#define read_bit(reg,bit)   (reg>>bit)&1
#define clear_bit(reg,bit)  reg &=~(1<<bit)
#define set_bit(reg,bit)    reg |=(1<<bit)

uint16_t spread_bits(uint8_t val) {
    // Your logic here
    uint8_t indx_8 =0;
    uint8_t indx_16 =0;
    uint16_t new_val = 0;
    for(indx_8=0;indx_8<8;indx_8++)
    {
        if(read_bit(val,indx_8))
        {
            set_bit(new_val,indx_16);
            indx_16 += 2;
        }
        else
        {
            indx_16 += 2;
        }
    }
    return new_val;
}

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

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