Chapter 2 - Writing a Rust Echo Clone –Part 4: Custom Output with -s and -d Flags

In the final part of building our custom echo command in Rust, we go beyond the standard CLI features by implementing two handy options: -s and -d.
These aren't part of Rust's official command-line book—but they add powerful flexibility to our tool.

✅ - -s: Skips separators, printing the arguments back-to-back (e.g., echo -s 1 3 4 becomes 134).
✅- - -d delim: Uses a custom delimiter between arguments (e.g., echo -d , 1 3 4 becomes 1,3,4).

We'll walk through the logic, handle parsing edge cases, and keep our code idiomatic and readable. This episode ties the project together and empowers your CLI to feel snappy and personalized.

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