LNCS: How to split DOI into multiple lines to avoid warning: Underfull hbox (badness 10000). on .bbl file?

I am writing a paper using the LNCS style and I have a lot of Underfull hbox warnings because URLs generated from the doi attribute of a Bib item do not split into multiple lines.

The LNCS style convert bibliography item doi value such as: 11.1111/111-1-1111-1111-1_11 into URL form: https://doi.org/11.1111/111-1-1111-1111-111.

Below is the minimum working example that generates the warning:

documentclass{llncs}
begin{document}

  Hello world, I cite somebody here cite{Somebody}.

bibliographystyle{splncs04}
bibliography{paper-bibliography}
end{document}

In the paper-bibliography.bib file I have the following entry:

@inbook{Somebody,
  author = {Somebody Someone},
  year = {2014},
  pages = {193--198},
  title = {Paper, Rock, and Scissors},
  isbn = {123-1-1234-1234-4},
  doi = {11.1111/111-1-1111-1111-1_11}
}

The code resulting in something like below:

and generated the following warning:

Underfull hbox (badness 10000)

I expect to avoid the Underfull warning and get the following result, where the URL is split into two lines, like the following

What I did to get the expected results is somewhat a hack to the Bib entry:

@inbook{Somebody,
    author = {Somebody Someone},
    year = {2014},
    pages = {193--198},
    title = {Paper, Rock, and Scissors},
    isbn = {123-1-1234-1234-4},
    url = {url{https://doi.org/11. 1111/111-1-1111-1111-1_11}}
}

I changed the doi entry to: url = {url{https://doi.org/11. 1111/111-1-1111-1111-1_11}} and able to get the desired result. However, I don’t think it is a good idea to change the doi values of all Bib entries that way.

Is there any proper way to get the expected result without modifying Bib item’s doi value?

@preamble{ "renewcommand{doi}[1]{url{https://doi.org/#1}}" }

doi = {11.1111/111-1-1111-1111-1_11}

urlstyle{rm}