Bug: Prefix should ignore space

[sp71]

Bug

If the prefix contains a space after the comma, it impacts the gci tool. It's common practice to use a space delimiter between commas in many applications; therefore, spaces should be ignored.

What version of GCI are you using?

0.11.1

Reproduce Steps

.golangci.yaml

linters-settings:
  gci:
    sections:
      - standard
      - default
      - prefix(github.com/company/library, github.com/company)
      - blank
      - dot
    skip-generated: true
    custom-order: true

linters:
  disable-all: true
  enable:
    - errcheck
    - gosimple
    - govet
    - ineffassign
    - staticcheck
    - unused
    - gci

run:
  issues-exit-code: 1

What did you expect to see?

Should group according to prefix ignoring space

What did you see instead?

Did not work as expected due to space. Had to remove space in prefix

      - prefix(github.com/company/library,github.com/company)