Bit Spreading Interleave Bits with Zeros

Code

#include <stdio.h>
#include <stdint.h>
#define CHECK_BIT(r,b)	 ((r >> b) & 1)

uint16_t spread_bits(uint8_t val) {
	uint16_t ret_val = 0;
    for(uint8_t i = 0;i<8;i++){
    	ret_val |=  (CHECK_BIT(val,i) << (i*2));
    }
    return ret_val;
}

int main() {
    uint8_t val;
    scanf("%hhu", &val);
    uint16_t result = spread_bits(val);
    printf("%u", result);
    return 0;
}

Solving Approach