fix (pop start_nodes)

Signed-off-by: Akira Hayakawa <ruby.wktk@gmail.com>
fix (use println! instead of explicit bufferedwriter)

Signed-off-by: Akira Hayakawa <ruby.wktk@gmail.com>
fix spacing

Signed-off-by: Akira Hayakawa <ruby.wktk@gmail.com>
fix spacing

Signed-off-by: Akira Hayakawa <ruby.wktk@gmail.com>
fix spacing

Signed-off-by: Akira Hayakawa <ruby.wktk@gmail.com>
fix spacing

Signed-off-by: Akira Hayakawa <ruby.wktk@gmail.com>
fix typo

Signed-off-by: Akira Hayakawa <ruby.wktk@gmail.com>
fix buffered reader

Signed-off-by: Akira Hayakawa <ruby.wktk@gmail.com>
refactor looping

Signed-off-by: Akira Hayakawa <ruby.wktk@gmail.com>