Cleanup a bit sanitize.go #2978
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The `isAnchor` function's first parameter was always `a`, instead of being passed `tagName`. As this function is a single line and was only called in a single place, it can be inlined.
- Use `token.String()` instead of `html.EscapeString(token.Data)` - Refactor conditions to highlight their similitude, enabling further refactoring This refactoring brings forth at least one bug: `tagStack` is never emptied.
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This PR should be reviewed commit by commit, and was done as part of #2900 to make the code easier to reason about, in order to optimize it in a follow-up PR.