Why the extra weird little space in the beginning? before how and why and how does it move to the next line?

[swap72]

[lomac]

Stdin in std::io - Rust

I quote:The trailing newline character, if any, is included in the buffer.

So if you want to remove the trailing white space, use the trim_end() function:

String in std::string - Rust

[nerditation]

readline() preserves the trailing newline character when you pressed the Enter key, you can use str::trim() to remove it:

println!("{}", name.trim());

[conqp]

To clarify even more, in your code, name = "Anthony\n". Now imagine that replacing {} in your format string.