public function unhardenedLast() {
        $path = $this->path;

        $last = array_pop($path);

        $last = str_replace("'", "", $last);

        $path[] = $last;

        return new static($path);
    }
public function unhardenedLast() {
        $path = $this->path;

        $last = array_pop($path);

        $last = str_replace("'", "", $last);

        $path[] = $last;

        return new static($path);
    }
public function unhardenedLast ( ) { $ path = $ this -> path ; $ last = array_pop ( $ path ) ; $ last = str_replace ( "'" , "" , $ last ) ; $ path [ ] = $ last ; return new static ( $ path ) ; }
unharden the last level of the path and return the new path

@return BIP32Path
unharden the last level of the path and return the new path