Remove diacritical marks (ń ǹ ň ñ ṅ ņ ṇ ṋ ṉ ̈ ɲ ƞ ᶇ ɳ ȵ) from Unicode chars

Question

I am looking at an algorithm that can map between characters with diacritics (tilde, circumflex, caret, umlaut, caron) and their \"simple\" character.

For example:

Answer 1

In case of German it's not wanted to remove diacritics from Umlauts (ä, ö, ü). Instead they are replaced by two letter combination (ae, oe, ue) For instance, Björn should be written as Bjoern (not Bjorn) to have correct pronounciation.

For that I would have rather a hardcoded mapping, where you can define the replacement rule individually for each special character group.