Refactoring the `CI_Log` line formatting - Extracting the `CI_Log` line formatting into a protected   function `_format_log_line()` so as to make it easy to   change the log line format via extending the class and   overriding the method.
Refactoring the `CI_Log` line formatting
- Extracting the `CI_Log` line formatting into a protected
  function `_format_log_line()` so as to make it easy to
  change the log line format via extending the class and
  overriding the method.

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