fix: capitalization logic

example/pubspec.lock

@@ -15,6 +15,6 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "1.2.1"
+    version: "1.2.2"
 sdks:
   dart: ">=3.4.0 <4.0.0"

lib/src/case/case.dart

@@ -15,7 +15,9 @@ extension Case on String {
             ? preserveAcronym
                 ? (word.isUpperCase() ? word : word.toLowerCase())
                 : word.toLowerCase()
-            : word.capitalize(),
+            : word.isUpperCase()
+                ? word
+                : word.capitalize(),
       )
       .toList()
       .join();
@@ -26,7 +28,11 @@ extension Case on String {
   /// uppercase. It is set to `false` by default
   String capitalize({bool capitalizeAll = false}) => switch (capitalizeAll) {
         true => toUpperCase(),
-        false => isEmpty ? '' : this[0].toUpperCase() + substring(1),
+        false => isEmpty
+            ? ''
+            : this[0] == this[0].toUpperCase()
+                ? this[0].toUpperCase() + substring(1).toLowerCase()
+                : this[0].toUpperCase() + substring(1),
       };
 
   /// Decapitalizes the first character of the string

pubspec.yaml

@@ -1,6 +1,6 @@
 name: stringr
 description: Comprehensive string manipulation plugin for dart. Handles operations on latin, non latin and grapheme clusters alike! Features inspured from VocaJs
-version: 1.2.1
+version: 1.2.2
 homepage: https://github.com/Chinmay-KB/stringr
 
 environment:

test/case/case_test.dart

@@ -26,6 +26,8 @@ void main() {
     expect("excuse moi".capitalize(capitalizeAll: true), "EXCUSE MOI");
     expect("".capitalize(), "");
     expect("macBook".capitalize(), "MacBook");
+    expect("HELLO".capitalize(), "Hello");
+    expect("HeLLo".capitalize(), "Hello");
     expect("яблоко".capitalize(), "Яблоко");
     expect("420".capitalize(), "420");
     expect("".capitalize(), "");