Serialized Data Buffer

Code

#include <stdio.h>
#include <stdint.h>
#include <string.h>
void build_packet(uint8_t command, uint16_t value, uint8_t status, uint32_t checksum) {
    uint8_t buffer[10];

    // Your logic to fill buffer
    uint8_t *ptr = buffer;
      *(ptr+0) = 0xA5;
      *(ptr+1) = command;
      *(ptr+2) = value & 0xff;
      *(ptr+3) = ((value >> 8) & 0xff); 
      *(ptr+4) = status;
      *(ptr+5) = checksum & 0xff;
      *(ptr+6) = (checksum >>8) & 0xff;
      *(ptr+7) = (checksum >>16) & 0xff;
      *(ptr+8) = (checksum >> 24) & 0xff;
      *(ptr+9) =  0x5A;
    // Then print buffer
    for(int i=0;i< 10;i++){
        printf("%d ",buffer[i]);
    }
}

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