Q:

words contains ffi

i want to use marine traffic website as a reference so i used the following
\bibitem{AIS} AIS \url{https://www.marinetraffic.com/en/}.

The web link appear in the text just fine but when you click on it is conveted to https://www.marinetra%0ec.com/en/ !!!!!
i think it is because of ffi in traffic but i don't know what to do with it.
the used packages are
\documentclass{marine_2015}
\usepackage{tikz}
\usepackage{graphicx}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{caption}
\usepackage{subcaption}
\usepackage{subfigure}
\usepackage{pgfplots}
\usepackage{setspace}
\usepackage{mathtools}

\begin{document}
aaaaaaa \cite{AIS} aaaaaa

\begin{thebibliography}{99}
\bibitem{AIS} AIS \url{https://www.marinetraffic.com/en/}.
\end{thebibliography}
\end{document}

there is a separate file for this document class
should i put it with my question ???

A:

I don't have the class file marine_2015.cls, but after switching to article, I propose that you load \usepackage{hyperref} and \usepackage{url}. I also had to remove subfigure since it's obsolate and conflicting subcaption. (I wonder if you tried to run the file you provided, and if yes, if you simply ignored the error it generates. Because ignoring errors in LaTeX is a way leading into disaster.)
\documentclass{article}
\usepackage{tikz}
\usepackage{graphicx}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{caption}
\usepackage{subcaption}
%\usepackage{subfigure}
\usepackage{pgfplots}
\usepackage{setspace}
\usepackage{mathtools}
\usepackage{hyperref,url}

\begin{document}
aaaaaaa \cite{AIS} aaaaaa

\begin{thebibliography}{99}
\bibitem{AIS} AIS \url{https://www.marinetraffic.com/en/} [2015-03-26].
\end{thebibliography}
\end{document}

