New test case for Phone Number exercise

[Aryan570]

A case like - "223.456abc.7890" should be added to tests cause a code like mine (in Rust) can easily pass the tests -

    let mut v = vec![' ';10];
    let mut tmp = 9;
    for ch in user_number.chars().rev(){
        match ch {
             c @ '0'..='9' =>{
                if (tmp == -1 && c != '1') 
                || (tmp == 0 && c == '1') 
                || (tmp == 0 && c == '0')
                || (tmp == 3 && c == '0')
                || (tmp == 3 && c == '1'){
                    return None;
                }
                if tmp >=0 {
                    v[tmp as usize] = c;
                }
                tmp -= 1;
            }
            _ => continue,
        }
    }
    if v[0] == ' '{return None;}
    Some(v.iter().collect())
}

test like this should be added (the code above will treat it as a valid number, but it isn't valid) -

fn invalid_chars() {
    let input = "223.456abc.7890";
    let output = number(input);
    assert!(output.is_none());
}

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