int lenght(const char *s)
{
  int count = 0;
  while(*(s+count) != '\0')
  {
    count++;
  }
  return count;
}

char *strconcat(const char *s, const char *t)
{
  char buffer[lenght(s)+lenght(t)];

  for(int i = 0; i != lenght(s); i++)
  {
    buffer[i] = s[i];
  }

  for(int i = 0; i != lenght(t); i++)
  {
    buffer[lenght(s)+i] = t[i];
    printf("%d\n", i);
  }

  buffer[lenght(s)+lenght(t)] = '\0';

  return buffer;
}


char *strinv(const char *s)
{
  int len = lenght(s);
  char buffer[len+1];

  for(int i = 0; i != len; i++)
  {
    buffer[len-1-i] = s[i];
  }
  buffer[len] = '\0';
  return buffer;
}