sanitize specification url, so it works for all types of OS. Fix for Wind…

[SlavchoArsovski]

PR checklist

• [ DONE] Read the contribution guidelines.
• [ DONE] Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh and ./bin/security/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\.
• [DONE ] Filed the PR against the correct branch: 3.0.0 branch for changes related to OpenAPI spec 3.0. Default: master.
• [ DONE] Copied the technical committee to review the pull request if your PR is targeting a particular programming language.

Description of the PR

Fix for:
File path for the specification was not sanitized and failing for Windows.

• [JAVA] Maven Codegen plugin for Java fails on windows, but works for unix (MAC) system #10844
• codegen.v3:swagger-codegen-maven-plugin 3.0.22 / 3.0.23 : can't parse OpenAPI YAML when servers url section present. #10823

[SlavchoArsovski]

@HugoMario could you review? this is fix for the blocker issues:
#10844
#10823

[HugoMario]

thanks @SlavchoArsovski ,

Going to check (and merge) this after next release.

[SlavchoArsovski]

@HugoMario, don't you think that would be too much time to wait for a urgent and small fix?

[SlavchoArsovski]

@HugoMario is there a chance to merge it, sry for being persistent but the branch is opened more than a month :)

[HugoMario]

Hi @SlavchoArsovski sorry for delay

Yea, this PR LGTM but i need to test your changes first make sure it works in differents OS as the title suggest. Just a doubt, why to create a one line method to this, instead just to call the string method directly?

[SlavchoArsovski]

Hi @SlavchoArsovski sorry for delay

Yea, this PR LGTM but i need to test your changes first make sure it works in differents OS as the title suggest. Just a doubt, why to create a one line method to this, instead just to call the string method directly?

From my side, it was tested on Windows 10 and Macintosh V10.15.7. Feel free to test it.
I have created a new line method as the expression is now used on two places.