\documentclass{article}
% Inner enumeration label to be x.1, x.2 x.3, x.4, ..., x.y%
\renewcommand{\labelenumii}{\arabic{enumi}.\arabic{enumii}}
% And the inner of the inner enumeration to be (a), (b), (c), (d), ..., (z)%
\renewcommand{\labelenumiii}{(\alph{enumiii})}
\input{structure.tex}
\title{Reykjavik university \\ \Huge Assignment Template}
\author{Student name \\ \texttt{Student@ru.is} \\
Student2 name \\ \texttt{Student2@ru.is}
\\ \textbf{Teachers} \\
Teacher name\\ \texttt{Teacher@ru.is} \\
Teacher2 name\\ \texttt{Teacher2@ru.is} }
\date{Háskólinn í Reykjavík --- Reykjavík University}
\makeatletter
\def\@maketitle{
\begin{center}
{\Huge \@title }\\[4ex]
\includegraphics[width = 50mm]{HRlogo.jpg} \\
{\Large \@author}\\[4ex]
\@date\\
\end{center}}
\makeatother
\begin{document}
\maketitle
\clearpage
\section{Tasks}
\begin{info}
\end{info}
\begin{enumerate}
\item \textit{(x points)} Task description
\begin{enumerate}
\item \textit{(x points)} Sub task description \\
\fbox{\fbox{\parbox{5.5in}{
Answer box
}}}
\item \textit{(x points)} Sub task description
\begin{enumerate}
\item \textit{(x points)} Sub sub task description \\
\fbox{\fbox{\parbox{5.5in}{
Answer box
}}}
\end{enumerate}
\end{enumerate}
\end{enumerate}
\end{document}
