Uhhh... the documentation is shit; still lost

Sources/OpenFoodFacts/Extension+String.swift

@@ -0,0 +1,21 @@
+extension String {
+    func camelCaseToSnakeCase() -> String {
+        var result = ""
+        var lastCharacterWasUppercase = false
+
+        for character in self {
+            if character.isUppercase {
+                if !result.isEmpty && !lastCharacterWasUppercase {
+                    result.append("_")
+                }
+                result.append(character.lowercased())
+                lastCharacterWasUppercase = true
+            } else {
+                result.append(character)
+                lastCharacterWasUppercase = false
+            }
+        }
+
+        return result
+    }
+}