Notmalize String based on given char.

Given a string and a char, normalize the string
by removing consecutive appearances of the char,
outputting a new string.
Two implementation are given:
- Inplace, which does not require additional memory.
- Fast, which process the input at O(n) but requires an additional memory (O(n)).

Both implementations output 3 results:
- Normalized string.
- Updated string length.
- The number of characters removed.