Function ClearFreeMemory

tutorials/common/imgui/imgui_internal.h:1067–1067

    ImGuiInputTextState()                   { memset(this, 0, sizeof(*this)); }
    void        ClearText()                 { CurLenW = CurLenA = 0; TextW[0] = 0; TextA[0] = 0; CursorClamp(); }
    void        ClearFreeMemory()           { TextW.clear(); TextA.clear(); InitialTextA.clear(); }
    int         GetUndoAvailCount() const   { return Stb.undostate.undo_point; }
    int         GetRedoAvailCount() const   { return STB_TEXTEDIT_UNDOSTATECOUNT - Stb.undostate.redo_point; }
    void        OnKeyPressed(int key);      // Cannot be inline because we call in code in stb_textedit.h implementation