Write library by temporary file creation to avoid in-place modification executed library

[bozaro]

1. Does this PR affect any open issues?(Y/N) and add issue references:

• N
• Y

Fix #73

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

• util.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
• Other

An application using KCL does not crash after installing a different version of KCL.

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

• 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)
• Other

See #73