buffer_seek - remove bytes from beginning of string in buffer

       buffer_seek  removes  r  bytes from the beginning of the string.  r must be at most the current length of
       the string.

       buffer_seek - remove bytes from beginning of string in buffer

buffer_init(3), buffer_feed(3), buffer_peek(3), buffer_get(3), buffer(3)

                                                                                                  buffer_seek(3)

#include<libowfat/buffer.h>

       void buffer_seek(buffer* b,size_t r);