Fix bug in camelize method

Model with inline_response_200 name has been camelized
to InlineResponseR00 which is obviously wrong.

Author: ybelenko

src/Utils/StringUtilsTrait.php

@@ -74,17 +74,17 @@ public static function camelize($word, $lowercaseFirstLetter = false)
             $original = $matches[2][0];
             $upperCase = strtoupper($original);
             if ($original === $upperCase) {
-                $word = preg_replace($p, '$2', $word);
+                $word = preg_replace($p, '$2', $word, 1);
             } else {
-                $word = preg_replace($p, $upperCase, $word);
+                $word = preg_replace($p, $upperCase, $word, 1);
             }
         }
 
         // Remove all hyphens (hyphen-case to camelCase)
         $p = '/(-)(.)/';
         while (preg_match($p, $word, $matches) === 1) {
             $upperCase = strtoupper($matches[2][0]);
-            $word = preg_replace($p, $upperCase, $word);
+            $word = preg_replace($p, $upperCase, $word, 1);
         }
 
         if ($lowercaseFirstLetter === true && strlen($word) > 0) {

test/Utils/ModelUtilsTraitTest.php

@@ -68,6 +68,9 @@ public function provideRefs()
             'number as argument' => [
                 156, null,
             ],
+            'inline response 200' => [
+                '#/components/schemas/inline_response_200', 'inline_response_200',
+            ],
         ];
     }
 
@@ -97,6 +100,7 @@ public function provideModelNames()
             ['abcd', 'WithStart', 'AndEnd', 'WithStartAbcdAndEnd'],
             ['_foobar_Objects', null, null, 'FoobarObjects'],
             [null, null, null, null],
+            ['inline_response_200', null, null, 'InlineResponse200'],
         ];
     }
 }

test/Utils/StringUtilsTraitTest.php

@@ -67,6 +67,9 @@ public function provideWordsForCamelizeTest()
 
             ['123', true, '123'],
             ['$123', true, '$123'],
+            ['_foobar_Objects', null, 'FoobarObjects'],
+            ['_foobar_Objects_small_Big', null, 'FoobarObjectsSmallBig'],
+            ['inline_response_200', null, 'InlineResponse200'],
         ];
     }