what can lib.rs do with main.rs file?
why most project don't include main.rs instead with lib.rs?
main.rs
defines a binary crate, lib.rs
defines a library crate;see project layout in the cargo doc
if a crate defines both a binary and a library, the code in main.rs
can make use of the library defined in the same crate (this is sometimes used to define multiple tools in a crate, sharing code), but not vice versa
lib.rs is for a library crate that other crates can use as dependencies.
main.rs is for an executable crate that is the final product.
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