Fixed a bug that content cannot be retrieved if "#" is included in a file or folder name.

[minoura-a]

I have confirmed that content can be retrieved even if "#" is included in the file or folder name.
I have confirmed that all unit tests passed.
#2587

[kfcampbell]

@minoura-a nice work! Would you mind adding tests for the new helper you created to match those here?

[minoura-a]

@kfcampbell
Thank you for confirming this.
I will create a test, please wait a couple of days.

[minoura-a]

@kfcampbell
Since the EncodeSharp method is only used within the StringExtensions class, the accessibility of the method has been changed to private.
This is a Commit.
For this reason, I do not believe testing is necessary.
Or, I may need additional testing of the FormatUri method that uses this method.

[kfcampbell]

I think it's still worthwhile to create a test for this behavior, similar to the one for EscapeDoubleQuotes.

[minoura-a]

@kfcampbell
I have created a test. Could you confirm it?
This is a commit.

[minoura-a]

@kfcampbell
I seem to be failing the Sourcelink test, is there anything I should do?