refactor: optimize string splitting

[Integral-Tech]

Description

Remove unnecessary calls of string splitting functions and optimize usage of string splitting methods.

Motivation and Context

Some string splitting function calls are unnecessary, such as:

match module_name.split('.').collect::<Vec<&str>>().last() {
    Some(v) => *v == "ko",
    None => false,
}

Some string splitting function calls can be simplified / optimized, such as:

if title.contains('!') {
	title = (*title
		.split('!')
		.collect::<Vec<&str>>()
		.last()
		.unwrap_or(&""))
	.to_string();
}

How Has This Been Tested?

cargo test passed.

Screenshots / Output (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation and changelog accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• Rustfmt and Rust-clippy passed.

[orhun]

LGTM, thanks!