How to print footnote at the end of a chapter

You can use packages like enotez, endnotes or maybe pagenotes for stuff like this. Since no MWE was provided the following examples show how to get the result for sections but the usage is analoguous for chapters.

enotez

documentclass{article}
usepackage{enotez,lipsum}

setenotez{
  reset ,
  list-heading = subsection*{#1}
}

begin{document}

section{Foo}

lipsum[1]endnote{test a}
lipsum[1]endnote{test a}

lipsum[1]endnote{test a}

printendnotes

section{Bar}

lipsum[1]endnote{test b}

lipsum[1]endnote{test b}
lipsum[1]endnote{test b}

printendnotes

end{document}

endnotes

documentclass{article}
usepackage{endnotes,lipsum}

counterwithin{endnote}{section}
renewcommandtheendnote{arabic{endnote}}

begin{document}

section{Foo}

lipsum[1]endnote{test a}
lipsum[1]endnote{test a}

lipsum[1]endnote{test a}

theendnotes

section{Bar}

lipsum[1]endnote{test b}

lipsum[1]endnote{test b}
lipsum[1]endnote{test b}

theendnotes

end{document}

pagenote

documentclass{article}
usepackage{pagenote,lipsum}

makepagenote
renewcommand*{notedivision}{subsection*{notesname}}
renewcommand*{pagenotesubhead}[2]{}


begin{document}

section{Foo}

lipsum[1]pagenote{test a}
lipsum[1]pagenote{test a}

lipsum[1]pagenote{test a}

printnotes*

section{Bar}

lipsum[1]pagenote{test b}

lipsum[1]pagenote{test b}
lipsum[1]pagenote{test b}

printnotes*

end{document}