how to line break this \mychapter?
if i use \chapter i can break line using \chapter[line 1 line 2]{line 1 \\ line 2}
\documentclass{report}
\newcommand{\mychapter}[2]{
\setcounter{chapter}{#1}
\setcounter{section}{0}
\chapter*{#2}
\addcontentsline{toc}{chapter}{#2}
}
\begin{document}
\tableofcontents
\mychapter{0}{Acknowledgments}
\mychapter{1}{Introduction}
\section{Introduction}
\section{Further Introduction}
\mychapter{2}{Experiments}
\section{Experiment One}
\section{Experiment Two}
\end{document}
and how remove paragraph/space above \mychapter?

