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Fix new clippy lints (#2036)
## Issue Addressed NA ## Proposed Changes Fixes new clippy lints in the whole project (mainly [manual_strip](https://rust-lang.github.io/rust-clippy/master/index.html#manual_strip) and [unnecessary_lazy_evaluations](https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_lazy_evaluations)). Furthermore, removes `to_string()` calls on literals when used with the `?`-operator.
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@@ -9,7 +9,7 @@ use types::{EthSpec, SignedBeaconBlock};
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pub fn run<T: EthSpec>(matches: &ArgMatches) -> Result<(), String> {
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let type_str = matches
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.value_of("type")
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.ok_or_else(|| "No type supplied".to_string())?;
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.ok_or("No type supplied")?;
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let path = parse_path(matches, "path")?;
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info!("Type: {:?}", type_str);
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