Documentation

https://docs.rs/collapse

fn collapse(s: &str) -> String;

#[macro_use]
use collapse::*;

collapsed_eq!("two  spaces", "two spaces");
collapsed_eq!("new\r\nlines", "new\nlines");
collapsed_eq!(" lead \t tail \r", "lead tail");

lib.rs:

Functions and macros to compare strings, ignoring whitespace