fix: use runes instead of codeUnits in AhoCorasick search

[Deepak8858]

The AhoCorasick search was using while the trie was built using . This caused matching to fail for emoji and other characters outside the Basic Multilingual Plane (BMP). This PR fixes the issue by using in the search loop as well.

Closes #31

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[master-wayne7]

@Deepak8858 I am closing this PR since it s a duplicate of #33 and also please don't target main branch, always create a PR to develop branch.