fix: parse octet

[Peefy]

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

• N
• Y

fix #1859

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

• kclvm/parser/src/lexer/string.rs

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

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

• test/grammar/datatype/str/octet/main.k

[coveralls]

Pull Request Test Coverage Report for Build 13871417207

Details

• 0 of 5 (0.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.003%) to 70.367%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/parser/src/lexer/string.rs	0	5	0.0%

Files with Coverage Reduction	New Missed Lines	%
kclvm/parser/src/lexer/string.rs	1	42.86%

Totals
Change from base Build 13760773029:	-0.003%
Covered Lines:	52638
Relevant Lines:	74805

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💛 - Coveralls