Return a string of all the characters in even positions
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 Syntax

        GT_CharEven(<cStr>) --> cRet

 Arguments:

      <cStr>   - A character string to extract chars from

 Returns:

      cRet     - A string of all the chars in even positions

 Description:

      Return a string consisting of all the characters in even
      positions in <cStr1>.

      NOTE:
         invalid parameters will return ""

 Examples:


      ? gt_CharEven("abcdefghijklm")             // prints "bdfhjl"


 Source: CHAREVEN.C

 Author:  Andy M Leighton