unjustify-current-line

unjustify-current-line is a compiled Lisp function in `fill.el'.

(unjustify-current-line)

Remove justification whitespace from current line.
If the line is centered or right-justified, this function removes any
indentation past the left margin. If the line is full-justified, it removes
extra spaces between words. It does nothing in other justification modes.