⚡ Bolt: [performance improvement] Optimize string allocations in casing module

.jules/bolt.md

@@ -0,0 +1,3 @@
+## 2024-05-23 - Verifying multiline code segments for optimizations
+**Learning:** Standard grep queries for multiline code snippets (like `collect::<Vec<_>>().join("")`) often fail because they search line-by-line, causing missed opportunities or unverified code edits. Rust code formatting frequently breaks method chains across multiple lines.
+**Action:** Always use tools like `sed -n 'start,endp' file`, `cat` with manual inspection, or `grep -C` to verify the exact structure of multiline code blocks *before* creating a plan to modify them with `replace_with_git_merge_diff`.

xdk-lib/src/casing.rs

@@ -29,11 +29,7 @@ impl Casing {
                     result
                 }
             }
-            Casing::Pascal => words
-                .iter()
-                .map(|w| pascal_case(w))
-                .collect::<Vec<_>>()
-                .join(""),
+            Casing::Pascal => words.iter().map(|w| pascal_case(w)).collect::<String>(),
             Casing::Kebab => words.join("-").to_lowercase(),
             Casing::ScreamingSnake => words.join("_").to_uppercase(),
         }
@@ -118,6 +114,6 @@ pub fn camel_case(value: &str) -> String {
     let mut chars = pascal.chars();
     match chars.next() {
         None => String::new(),
-        Some(first) => first.to_lowercase().collect::<String>() + chars.as_str(),
+        Some(first) => first.to_lowercase().to_string() + chars.as_str(),
     }
 }