just creating file, not creating directories. will be create fail when directories is not exists
change by File::create method, File::create not read permission
just open file see just_open_file
read all bytes to string
if file is so big, call this method is not good idea
if read fail, will be call log::error and return String::new()
see log::error, try_read_to_str
read all all to vec
if file is so big, call this method is not good idea
if read fail, will be call log::error and return Vec::new()
see log::error, try_read_to_vec