fix: handling @import with spaces and any extensions

[alexander-akait]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

fixes #1165

Breaking Changes

Hope, no

Additional Info

No

[codecov]

Codecov Report

Merging #1272 (b81b2c3) into master (3f49ed0) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1272   +/-   ##
=======================================
  Coverage   99.46%   99.46%           
=======================================
  Files          11       11           
  Lines         752      752           
  Branches      256      256           
=======================================
  Hits          748      748           
  Misses          4        4           

Impacted Files	Coverage Δ
src/index.js	100.00% <ø> (ø)
src/utils.js	98.76% <100.00%> (ø)

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