feat: Replace emojis when NO_EMOJI env variable present

src/exercise.rs

@@ -1,3 +1,4 @@
+use std::env;
 use regex::Regex;
 use serde::Deserialize;
 use std::fmt::{self, Display, Formatter};
@@ -126,8 +127,12 @@ name = "{}"
 path = "{}.rs""#,
                     self.name, self.name, self.name
                 );
+                let cargo_toml_error_msg = match env::var("NO_EMOJI").is_ok() {
+                    true => "Failed to write Clippy Cargo.toml file.",
+                    false => "Failed to write 📎 Clippy 📎 Cargo.toml file."
+                };
                 fs::write(CLIPPY_CARGO_TOML_PATH, cargo_toml)
-                    .expect("Failed to write 📎 Clippy 📎 Cargo.toml file.");
+                    .expect(cargo_toml_error_msg);
                 // To support the ability to run the clipy exercises, build
                 // an executable, in addition to running clippy. With a
                 // compilation failure, this would silently fail. But we expect