How to use \newenvironment in style file?

Question

I would like to use \newenvironment in my style file. It compiles perfectly in the TeX file but does not work in the style file (aka package). I suspect it's similar to the inability of using \newcommand in place of \renewcommand in a style file.

Sorry this is my first time posting a question.

MWE

I would love to have the \newenvironment{problem} along with \newcounter{problem} in the style file named stylesheet.sty.

\documentclass{article}
\usepackage{stylesheet}
\newcounter{problem}[section] % new counter for problems
\newenvironment{problem}{%
    % new environment for problems
    \refstepcounter{problem}\par\medskip
    \textbf{(\arabic{section}\alph{problem})}%
    }

\begin{document}

\section{Problem Title}
This is a dummy text for the first problem. % example text

\begin{problem}
This is a dummy text for the first part of problem 1 with a dummy equation.
\end{problem}

\end{document}

Answer 1

The

\newenvironment{problem}{%
    % new environment for problems
    \refstepcounter{problem}\par\medskip
    \textbf{(\arabic{section}\alph{problem})}%
    }

is missing the environment's end code section, i.e. the proper syntax is

\newenvironment{foo}[number of arguments]{start code}{end code}

(Of course, there may be no arguments at all)

In a document, it is working by change if there is white space after start code, but in a package with no white space or other content directly after it, it will prove fatal.

\ProvidesPackage{stylesheet}


\newcounter{problem}[section] % new counter for problems
\newenvironment{problem}{%
    % new environment for problems
  \refstepcounter{problem}\par\medskip
  \textbf{(\arabic{section}\alph{problem})}%
}{% 
%End code
}


\endinput

Driver file:

\documentclass{article}

\usepackage{stylesheet}
\begin{document}

\section{Problem Title}
This is a dummy text for the first problem. % example text

\begin{problem}
This is a dummy text for the first part of problem 1 with a dummy equation.
\end{problem}

\end{document}