expression_simplify 1.0.1

A simple expression simplifier based on OO course(SCSE, BUAA)
Documentation 
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pub struct Unit {
    coe: i32,
    pow: i32,
}

impl Unit {
    pub fn new(coe: i32, pow: i32) -> Unit {
        Unit {
            coe,
            pow,
        }
    }

    pub fn build_string(&self) -> String {
        format!("{}x^{}", self.coe, self.pow)
    }
}