🎨 Continued to rearrange core folders content

lib/core/mapping.dart

@@ -0,0 +1,30 @@
+String _upperCamelToLowerSnake(String input) {
+  final regex = RegExp(r'(?<=[a-z0-9])([A-Z])');
+  return input
+      .replaceAllMapped(regex, (match) => '_${match.group(0)}')
+      .toLowerCase();
+}
+
+Map<String, dynamic> convertMapKeysToSnakeCase(Map<String, dynamic> input) {
+  final result = <String, dynamic>{};
+
+  input.forEach((key, value) {
+    final newKey = _upperCamelToLowerSnake(key);
+
+    if (value is Map<String, dynamic>) {
+      result[newKey] = convertMapKeysToSnakeCase(value);
+    } else if (value is List) {
+      result[newKey] =
+          value.map((item) {
+            if (item is Map<String, dynamic>) {
+              return convertMapKeysToSnakeCase(item);
+            }
+            return item;
+          }).toList();
+    } else {
+      result[newKey] = value;
+    }
+  });
+
+  return result;
+}