Eliminating the word “Appendix”

Question

I use the following command to add an appendix to my thesis:

\appendix \chapter{Appendix} \section{Some stuff here} \section{Some other stuff here}

Then I see the following.

I do not want the word "Appendix" at the bottom right corner. Then I change the code above to

\appendix \chapter{} \section{Some stuff here} \section{Some other stuff here}

But this time the table of contents turns into this:

I still want the table of contents to say A. Appendix. How do I accomplish this?

Compilable code:

\documentclass[12pt,a4paper]{book}

\usepackage{amsmath, amssymb,amsthm}                      
\usepackage{fancyhdr}                                      
\usepackage{a4wide}                                         
\usepackage{placeins}                                       
\usepackage{graphicx, wrapfig, caption, subfig}             
\usepackage[dotinlabels]{titletoc}                          
\usepackage[ansinew]{inputenc}                              
\usepackage{array,arydshln}                                 
\usepackage[british]{babel}                                
\usepackage[Glenn]{fncychap}                                
\usepackage[hidelinks,pdfborder=000]{hyperref}
\usepackage{natbib,enumerate}
\usepackage[ddmmyyyy]{datetime}
\theoremstyle{definition}
\newtheorem{theorem}{Theorem}[chapter]
\newtheorem{definition}{Definition}[chapter]
\newtheorem{example}{Example}[chapter]
\usepackage{xcolor}
\usepackage{dsfont}
\makeatletter
\def\thm@space@setup{
  \thm@preskip=0.2cm plus 0cm minus 0cm
  \thm@postskip=\thm@preskip
}
\makeatother


\hypersetup{
    colorlinks,
    linkcolor={red!50!black},
    citecolor={blue!50!black},
    urlcolor={blue!80!black}
}

\setlength{\parindent}{0cm}                        
\setlength{\parskip}{1em}                          

\pagestyle{fancy}                                  
\fancyhead{}                                       
\fancyhead[C]{\leftmark}                          
\fancyfoot[C]{\bf{\thepage}}
\renewcommand{\headrulewidth}{0.4pt}               
\renewcommand{\footrulewidth}{0.4pt}               
\fancypagestyle{plain}{                            
\renewcommand\headrulewidth{0pt}                   
\fancyhead{}                                       
\fancyfoot[C]{}}                                  

\titlecontents{chapter}[0.7cm]                              
              {\vspace{-0cm}}                               
              {\bfseries\large\contentslabel{0.7cm}}                                                        
              {\bfseries\large\hspace{-0.7cm}}              
              {\titlerule*[2mm]{.}\bfseries\contentspage}

\setlength{\belowcaptionskip}{5pt}
\setlength{\abovecaptionskip}{5pt}
\usepackage{titlesec}
\usepackage{booktabs}
\usepackage{dcolumn}
\usepackage[title]{appendix}

\begin{document}
\frontmatter
\thispagestyle{empty}
\renewcommand{\contentsname}{Table Of Contents}
\setcounter{tocdepth}{2}
\tableofcontents
\mainmatter
\appendix
\chapter{Appendix}
Making the code compilable

\end{document}

Answer 1

Here is a way with apptools. I draw your attention to the fact that, according to the l2tabu guide, a4wide should not be used any more. If you want more sensible margins than the default, load geometry. Also hyperref should be loaded as the last package, with very few exceptions (most notable cleveref):

\documentclass[12pt,a4paper]{book}
\usepackage[utf8]{inputenc}

\usepackage{amsmath, amssymb,amsthm}
\usepackage{fancyhdr}
%\usepackage{a4wide}
\usepackage{geometry} \usepackage{placeins}
\usepackage{graphicx, wrapfig, caption, subfig}
\usepackage[dotinlabels]{titletoc}
\usepackage{array, arydshln}
\usepackage[british]{babel}
\usepackage[Glenn]{fncychap}
\usepackage{natbib,enumerate}
\usepackage[ddmmyyyy]{datetime}
\theoremstyle{definition}
\newtheorem{theorem}{Theorem}[chapter]
\newtheorem{definition}{Definition}[chapter]
\newtheorem{example}{Example}[chapter]
\usepackage{xcolor}
\usepackage{dsfont}
\makeatletter
\def\thm@space@setup{
  \thm@preskip=0.2cm plus 0cm minus 0cm
  \thm@postskip=\thm@preskip
}
\makeatother

\usepackage{titlesec}
\usepackage{booktabs}
\usepackage{dcolumn}
\usepackage[title]{appendix}
\usepackage{lipsum}

\usepackage[hidelinks,pdfborder=000]{hyperref}
\hypersetup{
    colorlinks,
    linkcolor={red!50!black},
    citecolor={blue!50!black},
    urlcolor={blue!80!black}
}

\setlength{\parindent}{0cm}
\setlength{\parskip}{1em}

\pagestyle{fancy}
\fancyhead{}
\fancyhead[C]{\leftmark}
\fancyfoot[C]{\bf{\thepage}}
\renewcommand{\headrulewidth}{0.4pt}
\renewcommand{\footrulewidth}{0.4pt}
\fancypagestyle{plain}{
\renewcommand\headrulewidth{0pt}
\fancyhead{}
\fancyfoot[C]{}}

\titlecontents{chapter}[0.7cm]
              {\vspace{-0cm}}
              {\bfseries\large\contentslabel{0.7cm}}
              {\bfseries\large\hspace{-0.7cm}}
              {\titlerule*[2mm]{.}\bfseries\contentspage}

\setlength{\belowcaptionskip}{5pt}
\setlength{\abovecaptionskip}{5pt}
\usepackage{apptools}
\AtAppendix{\renewcommand\appendixname{\relax}}

\begin{document}

\frontmatter
\thispagestyle{empty}
\renewcommand{\contentsname}{Table Of Contents}
\setcounter{tocdepth}{2}
\tableofcontents
\mainmatter

\chapter{A First Chapter}
\lipsum
\appendix
\chapter{Appendix}
Making the code compilable

\end{document}