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#!/bin/sh
//usr/bin/env rustc --test $0 -o kachow && ./kachow --nocapture; rm -f kachow ; exit
fn format_phone_number(phone: &str) -> String {
let digits: String = phone.chars().filter(|c| c.is_ascii_digit()).collect();
let mut result = Vec::new();
let mut i = 0;
while i < digits.len() {
let remaining = digits.len() - i;
let block_size = if remaining <= 4 && remaining != 3 {
2
} else {
3
};
result.push(&digits[i..i + block_size]);
i += block_size;
}
result.join("-")
}
#[test]
fn example() {
assert_eq!(format_phone_number("1-23-45-6"), "123-456");
assert_eq!(format_phone_number("1234"), "12-34");
assert_eq!(format_phone_number("12 345-6789"), "123-456-789");
assert_eq!(format_phone_number("123 4567"), "123-45-67");
assert_eq!(format_phone_number("123 456-78"), "123-456-78");
}
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