Fix #736

[Yiwei-Ding]

This PR is to fix #736.

Root cause

Block comments will have an extra whitespace before the comment content that gotten from group.Text(). In the following table, ▯ indicates to a whitespace.

comment	group.Text()
// #nosec	/* #nosec */
#nosec	▯#nosec

In PR #735, #nosec or other noSecAlternativeTag is treated as a prefix of the annotation. There was not a test case that covered block comments and resulted in #736.

Solution in this PR

Remove the whitespaces before comments with strings.Trim().

[codecov-commenter]

Codecov Report

Merging #738 (71fa103) into master (b45f95f) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #738   +/-   ##
=======================================
  Coverage   73.91%   73.91%           
=======================================
  Files          47       47           
  Lines        2891     2891           
=======================================
  Hits         2137     2137           
  Misses        692      692           
  Partials       62       62           

Impacted Files	Coverage Δ
analyzer.go	90.67% <100.00%> (ø)

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[ccojocar]

Thanks for fixing so quick the issue!