cppisgae

#include <iostream>
#include <string>
using namespace std;

int get_length(const char *ptr)
{
  for (int idx = 0; ptr[idx] != '\0'; idx++)
  {
    if (ptr[idx + 1] == '\0')
      return idx + 1;
  }
  return -1;
}

char *my_strconcat(const char *ptr1, const char *ptr2)
{
  int len = get_length(ptr1) + get_length(ptr2);
  char *writable = new char[len + 1];
  writable[len] = '\0';

  bool check = false;

  for (int idx = 0; idx < len; idx++)
  {
    if (ptr1[idx] == '\0')
    {
      check = true;
    }
    if (check)
    {
      writable[idx] = ptr2[idx - get_length(ptr1)];
      continue;
    }
    writable[idx] = ptr1[idx];
  }

  return writable;
}

char *convert_string(string pString)
{
  char *writable = new char[pString.size() + 1];
  int le = pString.size();
  writable[le] = '\0';

  for (int idx = 0; idx < le + 1; idx++)
  {
    writable[idx] = pString[idx];
  }

  return writable;
}

int main()
{
  string in1;
  string in2;
  char *out;
  cout << "Bitte ersten Text eingeben (ggfs. mit Leerzeichen): ? ";
  getline(cin, in1);
  cout << "Bitte zweiten Text eingeben (ggfs. mit Leerzeichen): ? ";
  getline(cin, in2);

  if (in1 != "" && in2 != "")
  {

    char *cstr1 = convert_string(in1);
    char *cstr2 = convert_string(in2);

    out = my_strconcat(cstr1, cstr2);

    cout << "Ergebnis my_strconcat(): " << out << endl;
  }
  else
  {
    cout << "Ergebnis my_strconcat(): " << endl;
  }

  system("PAUSE");
  return 0;
}