Function normalize 

pub fn normalize(s: &str, mode: Mode) -> String

Normalizes s according to mode, returning the canonical form that the assertion macros compare.

Examples

use assert_str::{normalize, Mode};

assert_eq!(normalize("a\r\nb", Mode::Lines), "a\nb");
assert_eq!(normalize("  a \n\n b ", Mode::Trim), "a\nb");
assert_eq!(normalize("a b\nc", Mode::TrimAll), "abc");