mine.3.0

#include<stdio.h>

int double_string (char *x)
{
  char copy[1024];
  int i = 0;
  while (x[i] != '\0')
  {
    copy[i] = x[i];
    i = i + 1;
  }
  copy[31] = '\0';
  for (int m = 0; m < 65; m++)
  {
    x[i] = copy[m];
    i = i + 1;
  }
  return 0;
}
int swap_letters(char replacer, char letter, char *string)
{

}

int main()
{
  char str[1024] = "Now I know how to program in C!";
  printf("%s\n", str);
  double_string(str);
  printf("%s\n", str);
  //swap_letters(*'o', *'i', str);
  return 0;
}