[ACM] 2007 tag checker - how to read a line and print every letter

#include
#include

int main()
{
  int bytes_read;
  //int nbytes = 100;
  size_t nbytes = 100;
  char *my_string;

  puts ("Please enter a line of text.");

  /* These 2 lines are the heart of the program. */
  my_string = (char *) malloc (nbytes + 1);
  bytes_read = getline (&my_string, &nbytes, stdin);

  if (bytes_read == -1)
    {
      puts ("ERROR!");
    }
  else
    {
      puts ("You typed:");
      
      // This is how to read a line and print every letter.
      int i=1;
        while(i < bytes_read){
              printf("%c\n",*my_string++);
              i++;
       
        }
    }

  return 0;
}