dropLast abstract method
Drop the last count characters from the range.
Retracts the end of the range to before the count last characters
of the range, or as many as are available if
there are fewer than count characters in the current range.
The count must not be negative.
If it is zero, the range is not changed.
Returns true if there are count characters in the range,
and false if there are fewer.
Implementation
bool dropLast([int count = 1]);