main.rs

struct AbPairs {
    word : String,
    abbreviation : String
}

struct SmallStr {
    small_str: String
}

impl SmallStr {
    fn import_from_str(&self, str: String) -> Option < SmallStr> {
        let a = SmallStr {
            small_str: str,
        };

        let check_length =
            if a.small_str.len() < 10 {
                Some(a)}
            else { None };
        return check_length;

    }
}

fn main() {
    let pairs = vec![
        AbPairs { word : "words".to_string() ,
            abbreviation : "words".to_string() } ,
        AbPairs { word : "hugebigword".to_string() ,
            abbreviation : "bgwrd".to_string() } ,
        AbPairs { word : "veryhugebigword".to_string() ,
            abbreviation : "vrbgwrd".to_string() },
        AbPairs { word : "hugellybigestword".to_string() ,
            abbreviation : "hgbgwrd".to_string() }

    ];

    let mut b =  "hugebigwo".to_string();
    let mut a = SmallStr{ small_str : b};
    match a.import_from_str(b){
        Some(String) => println!("success"),
        None => None
    }

    //println!("{}" , a.small_str);
}