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unicode_normalize 

        # String.unicode_normalize

(from ruby core)
---
    str.unicode_normalize(form=:nfc)

---

Unicode Normalization---Returns a normalized form of `str`, using
Unicode normalizations NFC, NFD, NFKC, or NFKD. The normalization form
used is determined by `form`, which can be any of the four values
`:nfc`, `:nfd`, `:nfkc`, or `:nfkd`. The default is `:nfc`.

If the string is not in a Unicode Encoding, then an Exception is raised.
In this context, 'Unicode Encoding' means any of UTF-8, UTF-16BE/LE, and
UTF-32BE/LE, as well as GB18030, UCS_2BE, and UCS_4BE. Anything other
than UTF-8 is implemented by converting to UTF-8, which makes it slower
than UTF-8.

    "a\u0300".unicode_normalize        #=> "\u00E0"
    "a\u0300".unicode_normalize(:nfc)  #=> "\u00E0"
    "\u00E0".unicode_normalize(:nfd)   #=> "a\u0300"
    "\xE0".force_encoding('ISO-8859-1').unicode_normalize(:nfd)
                                       #=> Encoding::CompatibilityError raised

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