refactor: use slices.Contains to simplify code

[jishudashen]

There is a new function added in the go1.21 standard library, which can make the code more concise and easy to read.

[CLAassistant]

All committers have signed the CLA.

[jishudashen]

@anishnaik Thanks for your review! If anything need I to do, Please feel free to tell me.

[jishudashen]

The CI error seems unrelated to this change

⇾ [FAILED] Assertion Test: TestExternalLibrary.fuzz_me()
Test for method "TestExternalLibrary.fuzz_me()" resulted in an assertion failure after the following call sequence:
[Call Sequence]
1) TestExternalLibrary.fuzz_me()() (block=23888, time=131275, gas=12500000, gasprice=1, value=0, sender=0x20000)
[Execution Trace]
 => [call] TestExternalLibrary.fuzz_me()() (addr=0x4B38070A432773e11B9E2A9967285Dd7b1f862B3, value=0, sender=0x20000)
	 => [proxy call] TestExternalLibrary -> Library3.getLibrary()() (addr=0x4B38070A432773e11B9E2A9967285Dd7b1f862B3, code=0xdbb516dbcC8c91A999eB6706cd0a03eAAfF6Cdc0, value=0, sender=0x20000)
		 => [proxy call] TestExternalLibrary -> Library2.getLibrary()() (addr=0x4B38070A432773e11B9E2A9967285Dd7b1f862B3, code=0x9bAfD307270677A3C3654B40F3F43a043B81f284, value=0, sender=0x20000)
			 => [proxy call] TestExternalLibrary -> Library1.getLibrary()() (addr=0x4B38070A432773e11B9E2A9967285Dd7b1f862B3, code=0xA647ff3c36cFab592509E13860ab8c4F28781a66, value=0, sender=0x20000)
				 => [return ("Library")]
			 => [return ("Library")]
		 => [proxy call] TestExternalLibrary -> Library1.getLibrary()() (addr=0x4B38070A432773e11B9E2A9967285Dd7b1f862B3, code=0xA647ff3c36cFab592509E13860ab8c4F28781a66, value=0, sender=0x20000)
			 => [return ("Library")]
		 => [return ("Library")]
	 => [panic: assertion failed]

[jishudashen]

Hi, @anishnaik Could you please review this PR when you have time? Thanks!