Related to #500.

considering it may not be immediately after consonant

This group is used as a padding between consonant letter and its other diacritics
which may be in arbitrary order

I am not sure if I translated this right. Do the flat and sharp emojis really refer to music?

1. only in separate words,
2. at the end of entered text.

Letter groups A, B, C, E etc. should be redefined in C code
t https://github.com/espeak-ng/espeak-ng/blob/master/docs/dictionary.md#redefinition-of-charater-groups

As Shadda is diacritic mark, it doesn't have meaning as separate letter,
therefore it should be consumed together with diacritized letter.