Function nb2fr

pub fn nb2fr(number: i64) -> String

Converts an integer to literal French text.

Examples:

assert_eq!(nb2fr::nb2fr(0), "zéro");
assert_eq!(nb2fr::nb2fr(-42), "moins quarante-deux");
assert_eq!(nb2fr::nb2fr(123), "cent vingt-trois");
assert_eq!(nb2fr::nb2fr(2_000_000_000), "deux milliards");