main.tex

\documentclass[a4paper, 12pt, twoside]{book}
\input{preamble.tex}
\subfile{3_backmatter/acronyms.tex}
\begin{document}

\frontmatter

    \subfile{1_frontmatter/titlepage}
        \newpage
        \thispagestyle{empty}
        \mbox{}
        \newpage
    \subfile{1_frontmatter/declaration.tex}
        \newpage
        \thispagestyle{empty}
        \mbox{}
        \newpage
    \subfile{1_frontmatter/abstract}
  
    \begin{spacing}{1.2}
        \tableofcontents%
    \end{spacing}

\mainmatter
% \pagestyle{fancy}
\addtocontents{toc}{\protect\vspace*{\fill}}
    \subfile{2_mainmatter/1_introduction/introduction}
    \subfile{2_mainmatter/2_preliminaries/preliminaries}
    \subfile{2_mainmatter/3_state_of_the_art/state_of_the_art}
\addtocontents{toc}{\protect\newpage}
    \subfile{2_mainmatter/4_generative_pattern_database/generative_pattern_database.tex}
    \subfile{2_mainmatter/5_experimental_evalution/experimental_evaluation}
    \subfile{2_mainmatter/6_conclusion/conclusion}

\backmatter
% \pagestyle{plain}
%     % \include{appendix.tex}
    \addcontentsline{toc}{chapter}{Bibliography}
    \printbibliography%
    \glsaddall
    \printnoidxglossary[title=List of Abbreviations, type=acronym, sort=letter, style=mylong]
    \printnoidxglossary[title=List of Symbols, sort=def, style=alttree]
    \listoftables
    \listoffigures
    \addcontentsline{toc}{chapter}{List of Algorithms}
    \listofalgorithms
    
\end{document}