C# implements the writing of reverse strings

//string concatenation with for loop
public string ReverseA(string text)
{
  char[] cArray = ();
  string reverse = ;
  for (int i =  - 1; i > -1; i--)
  {
    reverse += cArray[i];
  }
  return reverse;
}

//  function
public string ReverseB(string text)
{
  char[] charArray = ();
  (charArray);
  return new string(charArray);
}

// push/pop Stack<>
public string ReverseC(string text)
{
  Stack resultStack = new Stack();
  foreach (char c in text)
  {
    (c);
  }

  StringBuilder sb = new StringBuilder();
  while ( > 0)
  {
    (());
  }
  return ();
}

// LINQ
public string ReverseD(string text)
{
  return new string(().Reverse().ToArray());
}

// StringBuilder
public string ReverseE(string text)
{
  char[] cArray = ();
  StringBuilder reverse = new StringBuilder();
  for (int i =  - 1; i > -1; i--)
  {
    (cArray[i]);
  }
  return ();
}