new lint: suggest pulling identical methods out of conditional BBs

#[cfg_attr(feature = "cargo-clippy", warn(pedantic))]

fn main() {
    let x = 4;
    let y = if x > 4 {
        String::from("hello world").repeat(2).to_uppercase().replace("world", "universe")
    } else {
        String::from("hello world").to_uppercase().replace("world", "universe")
    };
    println!("{}", y);
}

This could be deduplicated slightly to

fn main() {
    let x = 4;
    let y = if x > 4 {
        String::from("hello world").repeat(2)
    } else {
        String::from("hello world")
    }.to_uppercase()
    .replace("world", "universe");
    println!("{}", y);
}

The issue provides Rust examples but names no source file, test, or entry point. Start by using the examples to define the requested lint behavior and suggested rewrite, then locate the existing lint and test patterns before verifying coverage for equivalent conditional branches.