Add more utils & test cases

Author: ndaidong

CONTRIBUTING.md

@@ -2,27 +2,28 @@
 
 Glad to see you here.
 
-Collaborations and pull requests are always welcomed, though larger proposals should be discussed first.
-
-As an OSS, it's better to follow the Unix philosophy: "do one thing and do it well".
+Collaborations and pull requests are always welcomed, though larger proposals
+should be discussed first.
 
+As an OSS, it's better to follow the Unix philosophy: "do one thing and do it
+well".
 
 ## Third-party libraries
 
-Please avoid using libaries other than those available in the standard library, unless necessary.
-
-This library needs to be simple and flexible to run on multiple platforms such as Deno, Bun, or even browser.
+Please avoid using libaries other than those available in the standard library,
+unless necessary.
 
+This library needs to be simple and flexible to run on multiple platforms such
+as Deno, Bun, or even browser.
 
 ## Documentation
 
 If you've changed APIs, please update README.
 
-
 ## Clean commit histories
 
-When you open a pull request, please ensure the commit history is clean.
-Squash the commits into logical blocks, perhaps a single commit if that makes sense.
+When you open a pull request, please ensure the commit history is clean. Squash
+the commits into logical blocks, perhaps a single commit if that makes sense.
 
 What you want to avoid is commits such as "WIP" and "fix test" in the history.
 This is so we keep history on master clean and straightforward.
@@ -32,9 +33,9 @@ For people new to git, please refer the following guides:
 - [Writing good commit messages](https://github.com/erlang/otp/wiki/writing-good-commit-messages)
 - [Commit Message Guidelines](https://gist.github.com/robertpainsi/b632364184e70900af4ab688decf6f53)
 
-
 ## License
 
-By contributing to `@extractus/oembed-extractor`, you agree that your contributions will be licensed under its [MIT license](LICENSE).
+By contributing to `@extractus/oembed-extractor`, you agree that your
+contributions will be licensed under its [MIT license](LICENSE).
 
 ---