Your code in the .sty is a little bit unconventional. In any case, the
most common in LaTeX is to use etoolbox package.
\usepackage{etoolbox}
\newenvironment{env}{whatever goes here}{whatever goes here}
\AtBeginEnvironment{env}{<begin environment>}
\AtEndEnvironment{env}{<end environment>}
\BeforeBeginEnvironment{<before environment>}
\AfterEndEnvironment{<after environment>}
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