Structure the code in modules

Learning
,
15

Additionally, you can change

(library 
    (name BooleanFormulae)
    (libraries angstrom)
    (preprocess (pps ppx_deriving.show ppx_deriving.ord)))

to

(library 
    (name BooleanFormulae)
    (libraries angstrom)
    (modules parser types)
    (preprocess (pps ppx_deriving.show ppx_deriving.ord)))

to be able to access BooleanFormulae.Parser from main.ml.

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