fn string_to_formula(string: & String)->f64{
    let mut return_def:f64 = 0.0;
    let mut string_for_arr = &string[1..string.len()-1];
    let mut arr: Vec<&str> = string_for_arr.split_whitespace().collect();
    for _i in 0..arr.len(){
        match arr[_i] {
            "AVG"=> return_def,
            "SUM"=> return_def,
            _=>{
                let poor: f64 = arr[0].parse().unwrap();
                poor
            }
        }
        return_def
    }
    return_def
}