Task: Implement a Log Line Parser in C

Write a C program that parses structured log lines from stdin and extracts fields. Each log line has the format:

[TIMESTAMP] LEVEL: MESSAGE (source=FILENAME)

For example:

[2024-01-15T10:30:45] ERROR: Connection timeout (source=network.c)

The program should:

1. Read log lines from stdin (one per line, max 1024 chars each)
2. Parse each line to extract: timestamp, level, message, and source filename
3. Format and print a summary: LEVEL | FILENAME | MESSAGE
4. Handle malformed lines gracefully (skip them with a warning)

Create the source file logparser.c and a Makefile to build it. The program should handle up to 100 log lines.