performance optimization

[XiaoK29]

1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):

• [x] N
• [ ] Y

2. What is the scope of this PR (e.g. component or file name):

pkg/tools/list/import_dep_parser.go pkg/tools/list/utils.go

3. Provide a description of the PR(e.g. more details, effects, motivations or doc link):

• [ ] Affects user behaviors
• [ ] Contains syntax changes
• [ ] Contains variable changes
• [ ] Contains experimental features
• [ ] Performance regression: Consumes more CPU
• [ ] Performance regression: Consumes more Memory
• [x] Other

4. Are there any breaking changes?(Y/N) and describe the breaking changes(e.g. more details, motivations or doc link):

• [x] N
• [ ] Y

5. Are there test cases for these changes?(Y/N) select and add more details, references or doc links:

• [ ] Unit test
• [ ] Integration test
• [ ] Benchmark (add benchmark stats below)
• [ ] Manual test (add detailed scripts or steps below)
• [x] Other

[coveralls]

Pull Request Test Coverage Report for Build 9218379594

Details

• 3 of 4 (75.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.007%) to 62.351%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/tools/list/import_dep_parser.go	1	2	50.0%
<!--	Total:	3	4	75.0%	-->

Totals
Change from base Build 9218231870:	-0.007%
Covered Lines:	3342
Relevant Lines:	5360

---

💛 - Coveralls