rename count_freq to edge-merge, update CMakeLists

Signed-off-by: xiehuc <xiehuc@gmail.com>
modify indent, retab file

Signed-off-by: xiehuc <xiehuc@gmail.com>
change cout to cerr and remove outfile

默认直接把结果输出到屏幕，如果需要保存文件，使用重定向即可。

Signed-off-by: xiehuc <xiehuc@gmail.com>
simplify sscanf rules

Signed-off-by: xiehuc <xiehuc@gmail.com>