You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: gnf.rs
    path of file: ./repos/rusty-razor/razor-fol/src/transform
    
    the code of the file until where you have to start completion: /*! Defines formulae in Geometric Normal Form (GNF) and implements an algorithm for
transforming a [`CNF`] to a [`GNF`].

[`CNF`]:
    
fn gnf(clause: &Clause<Complex>) -> GNF {
    let mut head: Vec<PCF> = Vec::new();
    let mut body: Vec<Atomic<_>> = Vec::new();
    clause.iter().for_each(|lit| match lit {
        Literal::Pos(this) => head.push(this.clone().into()),
        Literal::Neg(this) => body.push(this.clone()),
    });

    let body = PCF::from(body);
    let head = PcfSet::from(head);
    (body, head).into()
}