% ┌                                                ┐
% │                     Index                      │
% └                                                ┘

% For using index package
\newcommand{\prepareIndex}{
    \RequirePackage[T1]{fontenc}
    \RequirePackage{imakeidx}
    \makeindex
}

\newcommand{\addIndexBold}[1]{\textbf{\index{\MakeLowercase{#1}} #1}}
\newcommand{\addIndexBI}[1]{\textbf\textit{{\index{\MakeLowercase{#1}} #1}}}
\newcommand{\addIndexItalic}[1]{\textit{\index{\MakeLowercase{#1}} #1}}
\newcommand{\addIndex}[1]{\index{\MakeLowercase{#1}} #1}