guiChat.java

String s = message.trim();
            if (s.length() > 0)
            {
                String s1 = message.trim();
                String firstChar = s1.substring(0, 1);
                String lastChar = s1.substring( s1.length()-1, s1.length());
                String s2 = firstChar + s1 + lastChar;
                if (mc.lineIsCommand(s1)) {
                    mc.thePlayer.sendChatMessage(s1 + "Test");
                }
                    if (!mc.lineIsCommand(s1))
                    {
                        mc.thePlayer.sendChatMessage(s1 + "Test2");
                    }
            }

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Minecraft.java

public boolean lineIsCommand(String s)
    {
        if (s.startsWith("/"));
        return true;
    }