/*
In this task, you should get familiar with
malloc(), realloc() and free().

- user input: sequence of characters
- store in array of characters
- dynamically increase memory on heap for array
- temporary pointer for return value of realloc()
- add All characters to array until Q is entered
- check if mem-alloc OK after each malloc() / realloc()
- If mem-alloc NOK
  - print: "Memory allocation failed\n"
  - return 1
- free allocated memory at the end of main()

Examples:

awe  s o m e  !Q
Entered characters: a w e s o m e !

IS   P   !  :)    Q
Entered characters: I S P ! : )
*/

#include <stdio.h>
#include <stdlib.h> // TODO: Include the required header file

int main(void)
{
  int capacity = 2;
  int count = 0;
  char *characters = NULL;

  characters = (char *)calloc(capacity, sizeof(char)); // TODO: Allocate memory (make use of the variable capacity)
  if (characters == NULL)
  {
    printf("Memory allocation failed\n");
    return 1;
  } // TODO: Check if memory could be allocated

  char value = 0;
  while (scanf(" %c", &value) && value != 'Q')
  {
    if (count == capacity) // TODO: Check capacitiy and use realloc() to not run out of memory on the heap
    {
      capacity = capacity * count;
      char *temp_chars = (char*)realloc(characters, sizeof(char) * capacity);
      if (temp_chars == NULL)
      {
        printf("Memory allocation failed\n");
        return 1;
      }
      characters = temp_chars;
    } // TODO: Check if memory could be allocated
    characters[count] = value;
    count++;
    // TODO: Add the entered value to the characters array
  }

  printf("Entered characters:");
  for (int i = 0; i < count; i++)
  {
    printf(" %c", characters[i]);
  }
  printf("\n");

  free(characters); // TODO: Free the allocated memory

  return 0;
}