refactor: replace strings with single characters

Author: hamirmahal

numbat-cli/src/completer.rs

@@ -77,8 +77,8 @@ impl Completer for NumbatCompleter {
         // does it look like we're tab-completing a timezone (via the conversion operator)?
         let complete_tz = line
             .find("->")
-            .or_else(|| line.find("→"))
-            .or_else(|| line.find("➞"))
+            .or_else(|| line.find('→'))
+            .or_else(|| line.find('➞'))
             .or_else(|| line.find(" to "))
             .and_then(|convert_pos| {
                 if let Some(quote_pos) = line.rfind('"') {

numbat/src/module_importer.rs

@@ -121,7 +121,7 @@ impl ModuleImporter for BuiltinModuleImporter {
             .map(|path| {
                 ModulePath(
                     path.trim_end_matches(".nbt")
-                        .split("/")
+                        .split('/')
                         .map(|s| s.to_string())
                         .collect(),
                 )

numbat/src/number.rs

@@ -69,7 +69,7 @@ impl Number {
                     formatted_number.to_string()
                 }
             } else if formatted_number.contains('e') && !formatted_number.contains("e-") {
-                formatted_number.replace("e", "e+")
+                formatted_number.replace('e', "e+")
             } else {
                 formatted_number
             }