* Remove the continuation characters from the input string.
* This is the very first step in preprocessing and is effective
* even inside comment blocks.
* If there is a whitespace between a backslash and a newline,
* this is not considered as a line continuation.
* Remove the continuation characters from the input string.
* This is the very first step in preprocessing and is effective
* even inside comment blocks.
* If there is a whitespace between a backslash and a newline,
* this is not considered as a line continuation.