Extract Packet Fields from Byte Stream

Code

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

typedef struct {
    uint8_t start;
    uint8_t command;
    uint16_t data;
    uint8_t crc;
    uint8_t end;
} Packet;

uint16_t append(uint16_t num1 ,uint16_t num2)
{
    uint16_t result = 0;
    result = result |(num2<<8);
    result|=(num1);
    return result;
}
void print_packet_fields(uint8_t *buffer) {
    // Overlay struct and print values
    printf("Start: %d\n",buffer[0]);
    printf("Command: %d\n",buffer[1]);
    printf("Data: %d\n",append(buffer[2],buffer[3]));
    printf("CRC: %d\n",buffer[4]);
    printf("End: %d",buffer[5]);
}

int main() {
    uint8_t buffer[6];
    for (int i = 0; i < 6; i++) {
        scanf("%hhu", &buffer[i]);
    }
    print_packet_fields(buffer);
    return 0;
}

Solving Approach