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pub mod phone{
    pub fn is_valid_phone(phone:&str) -> bool{
        let mut count = 0;
        let pos = phone.find("+");
        
        for i in phone.as_bytes(){
            if i < &48 && i !=&43 || i > &57 && i != &43{
                return false;
            } else { 
                if i == &43{
                    count+=1;
                }
            }
            if pos != None{
                if count > 1 || pos.unwrap() != 0{
                    return false;
                } 
            }
        }
        true
    }
}
pub use phone::is_valid_phone;