If you want to delete an entire block of whitespace at point, you can use hungry deletion. This deletes all the contiguous whitespace either before point or after point in a single operation. Whitespace here includes tabs and newlines, but not comments or preprocessor commands.
Delete the entire block of whitespace preceding point (
Delete the entire block of whitespace after point (
As an alternative to the above commands, you can enable hungry delete mode. When this feature is enabled (indicated by ‘/h’ in the mode line after the mode name), a single DEL deletes all preceding whitespace, not just one space, and a single C-d (but not plain Delete) deletes all following whitespace.
Toggle the hungry-delete feature
c-toggle-hungry-state). With a prefix argument,
this command turns the hungry-delete feature on if the argument is
positive, and off if it is negative.
The variable c-hungry-delete-key controls whether the hungry-delete feature is enabled.