Refactor finalseg

[xu-song]

The above code is redundant

jieba/jieba/__init__.py

Lines 262 to 287 in 67fa2e3

	if buf:
	if len(buf) == 1:
	yield buf
	buf = ''
	else:
	if not self.FREQ.get(buf):
	recognized = finalseg.cut(buf)
	for t in recognized:
	yield t
	else:
	for elem in buf:
	yield elem
	buf = ''
	yield l_word
	x = y
	if buf:
	if len(buf) == 1:
	yield buf
	elif not self.FREQ.get(buf):
	recognized = finalseg.cut(buf)
	for t in recognized:
	yield t
	else:
	for elem in buf:
	yield elem

This commit refactor finalseg, and remove duplication