* Removes the `: ` prefix in our previous pattern to capture case ii and reduce false negatives:
1. Our previous pattern (i.e. `: Syntax error`) is designed to reduce false positives, but it relies on `dash` to print out an error message within one `write` syscall. E.g. `sh: 1: Syntax error: "invalid_command" unexpected`.
2. In some cases, `dash` breaks the message into multiple `write` syscalls. E.g. it invokes 2 `writes` whose buffers respectively contain `sh: 1:`, ` Syntax error: "invalid_command" unexpected`.
* Fix outdated wording
* A TODO about using more specific patterns of error messages
* An attempt to detect shell injection with ptrace
* Relocate sanitizer files
* Add headers and file descriptions
* Better cleanup
* Name and analogy
* TODOs
* safer cleanup
* More descriptive name
* More descriptive README.md
* More descriptive file names
* One more TODOs
Dongge Liu