Fix lint warnings for rust-1.79 #769
Merged
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2 things that are recommended by rust-lang - implementing
std::fmt::Display
rather than ToString (1) and using clone_from (2).[1] https://rust-lang.github.io/rust-clippy/master/index.html#/to_string_trait_impl
[2] https://rust-lang.github.io/rust-clippy/master/index.html#assigning_clones