Serialized Data Buffer

Code

#include <stdio.h>
#include <stdint.h>
union data_conv
{
    uint32_t checksum_val;
    uint8_t checksum_buff[4];
};

union data_conv_val
{
    uint16_t val;
    uint8_t value_buff[2];
};

void build_packet(uint8_t command, uint16_t value, uint8_t status, uint32_t checksum) {
    uint8_t buffer[10];
    data_conv data_buff;
    data_conv_val data_val_buff;
    data_val_buff.val = value;
    data_buff.checksum_val = checksum;

    // Your logic to fill buffer
    for(int x = 0; x < 10; x++)
    {
        if (x == 0) buffer[x] = 0xA5;
        if (x == 1) buffer[x] = command;
        if (x == 2)
        {
            for (int y = 0; y < 2; y++)
            {
                buffer[2+y] = data_val_buff.value_buff[y];
            } 
        }
        if (x == 4) buffer[x] = status;
        if (x == 5)
        {
            for (int y = 0; y < 5; y++)
            {
                buffer[5+y] = data_buff.checksum_buff[y];
            }
        }
    }
    buffer[9] = 0x5A;
    // Then print buffer
    for (int i = 0; i < 10; i++) {
        printf("%d", buffer[i]);
        if(i < 10-1){
        	printf(" ");
        }
    }
}

int main() {
    uint8_t cmd, status;
    uint16_t val;
    uint32_t crc;

    scanf("%hhu %hu %hhu %u", &cmd, &val, &status, &crc);
    build_packet(cmd, val, status, crc);
    return 0;
}

Solving Approach