如何删除行中自动提供的多余空格？

Question

我正在写参考书目。在某一处，出现了一些多余的空格。无论如何我都无法修复它。

\begin{thebibliography}{90}
    \bibitem{Ref1} Java, \url{https://en.wikipedia.org/wiki/Java_(programming_language)}
    \bibitem{Ref2} James Gosling, \url{https://en.wikipedia.org/wiki/James_Gosling}
    \bibitem{Ref3} Java Compiler, \url{https://www.jdoodle.com/online-java-compiler/}
    \bibitem{Ref4} Escape Sequence, \url{https://docs.oracle.com/javase/tutorial/java/data/characters.html}
    \bibitem{Ref5} Format-Specifier, \url{https://www.geeksforgeeks.org/format-specifiers-in-java/}
\end{thebibliography}