API strtrim

Trim characters (chars), off the left and right of str
 local newstr = strtrim(str[, chars])
==Arguments==
:(str[, chars])
:;str: - The input string.
:;chars: - A list of characters to remove from the left and right of str.
::: If left off, it defaults to " \t\r\n" ([space][tab][return][newline]).
::: If adding this argument, please note that spaces will not be trimmed unless you include one with the other characters ("123" is not the same as " 123").
==Returns==
:;newstr: - The modified string.
==Example==
 str = "///All debug and no play, make Eric go crazy.\n\n"
 a = strtrim(str, "/\n");
 DEFAULT_CHAT_FRAME:AddMessage(a);
Result
 All debug and no play, make Eric go crazy.