Abbreviate or Unabbreviate numbers in rust

For Numbers Less Then 1

Input	Output
0.1	100m
0.01	10m
0.001	1m
0.000_000_001	1n
0.000_000_000_000_000_000_000_000_000_1	100q

For Numbers Greater Then 1

Input	Output
1_000	1K
1_000_000	1M
1_090	1.09K
001_090	1.09K
123_000_000_000_000_000_000	123E
-123_000_000_000_000_000_000	-123E
1_000_000_000_000_000_000_000_000_000_000	1Q

Input	Output
1K	1000
1.09K	1090
1_090	1.09K
123E	123_000_000_000_000_000_000
1Q	1_000_000_000_000_000_000_000_000_000_000

Usage Example :

fn main() {

    // numbers greater then 1:
    println!("{}", 123.abbreviate_number(&Default::default())); // result: 123
    println!("{}", 123_000.0.abbreviate_number(&Default::default())); //result: 123K

    println!("{}", "1K".unabbreviate_number(&Default::default())); //result: 1000.0
    println!("{}", "1M".unabbreviate_number(&Default::default())); //result: 1000000.0

    // numbers less then 1:
    println!("{}", (0.1).abbreviate_number(&Default::default())); // result: 100m
    println!("{}",(0.000_000_001).abbreviate_number(&Default::default())); //result: 1n

    println!("{}", "111z".unabbreviate_number(&Default::default())); // result : 0.000000000000000000111
    println!("{}", "100n".unabbreviate_number(&Default::default())); // result : 0.0000001

}

Also For Big Int Numbers:

fn main() {
    let big_num: i128 = 999_509_999_999_999_000_123_123_000_000_123;
    println!("{}", big_num.abbreviate_number(&Default::default())); // result : 999.5Q
}

Customize Format:

fn main(){
 assert_eq!(
            "100-q",
            (0.000_000_000_000_000_000_000_000_000_1).abbreviate_number(&AbbreviationOptions {
                padding: 0,
                separator: "-".to_string()
            })
        );

 assert_eq!(
            "-100   q",
            (-0.000_000_000_000_000_000_000_000_000_1).abbreviate_number(&AbbreviationOptions {
                padding: 3,
                ..Default::default()
            })
        );
}

Note:

Symbols Are Case-Sensitive And Program Will Automaticly Remove Leading Zero (001 Will Become 1 and etc)

Table Of Metric Prefix:

Symbol	Base
q	$10^ {-30}$
r	$10^ {-27}$
y	$10^ {-24}$
z	$10^ {-21}$
a	$10^ {-18}$
f	$10^ {-15}$
p	$10^ {-12}$
n	$10^ {-9}$
μ	$10^ {-6}$
m	$10^ {-3}$
	$10^{0}$
K	$10^{3}$
M	$10^ {6}$
G	$10^ {9}$
T	$10^ {12}$
P	$10^ {15}$
E	$10^ {18}$
Z	$10^ {21}$
Y	$10^ {24}$
R	$10^ {27}$
Q	$10^{30}$

TODO :

- [ ] Optimize Code
- [ ] Create Custom Symbols 
- [x] Custom separator pass by option
- [ ] Create Unit Conversion