Account for Every Line Ending

Task

Write scan_line_endings(data), where data is a bytes value. Return one record for every line while distinguishing these endings:

• "LF" for b"\n";
• "CRLF" for the two-byte sequence b"\r\n";
• "CR" for a lone b"\r";
• "NONE" for a final line with no ending.

Each record is a five-item tuple:

(line_number, start, content_end, end, ending)

Positions are zero-based byte offsets. start:content_end is the line content; content_end:end is its ending. Line numbers begin at 1. A terminating line ending closes the current line but does not create an extra empty line after the end of the input. An empty input returns []; consecutive endings do create empty lines.

Example

The spans account for every byte exactly once. CRLF is one ending, not a lone CR followed by an empty LF line.

Your implementation

Edit solution.py and keep this function signature:

Return a new list of tuples. Do not decode or change data, print, or ask for input.