examples: update methods signatures

Update methods signatures in order to generate correct manifest files
with full description of available methods.

examples/storage/storage.go

@@ -7,51 +7,72 @@ import (
 
 // Main is a very useful function.
 func Main(operation string, args []interface{}) interface{} {
-	ctx := storage.GetContext()
-
-	// Puts value at key
 	if operation == "put" {
-		if checkArgs(args, 2) {
-			key := args[0].([]byte)
-			value := args[1].([]byte)
-			storage.Put(ctx, key, value)
-			return key
-		}
+		return Put(args)
 	}
 
-	// Returns the value at passed key
 	if operation == "get" {
-		if checkArgs(args, 1) {
-			key := args[0].([]byte)
-			return storage.Get(ctx, key)
-		}
+		return Get(args)
 	}
 
-	// Deletes the value at passed key
 	if operation == "delete" {
-		key := args[0].([]byte)
-		storage.Delete(ctx, key)
-		return true
+		return Delete(args)
 	}
 
-	// Returns an array of key-value pairs with key that matched the passed value
 	if operation == "find" {
-		if checkArgs(args, 1) {
-			value := args[0].([]byte)
-			iter := storage.Find(ctx, value)
-			result := []string{}
-			for iterator.Next(iter) {
-				val := iterator.Value(iter)
-				key := iterator.Key(iter)
-				result = append(result, key.(string)+":"+val.(string))
-			}
-			return result
-		}
+		return Find(args)
 	}
 
 	return false
 }
 
+// Put puts value at key.
+func Put(args []interface{}) interface{} {
+	ctx := storage.GetContext()
+	if checkArgs(args, 2) {
+		key := args[0].([]byte)
+		value := args[1].([]byte)
+		storage.Put(ctx, key, value)
+		return key
+	}
+	return false
+}
+
+// Get returns the value at passed key.
+func Get(args []interface{}) interface{} {
+	ctx := storage.GetContext()
+	if checkArgs(args, 1) {
+		key := args[0].([]byte)
+		return storage.Get(ctx, key)
+	}
+	return false
+}
+
+// Delete deletes the value at passed key.
+func Delete(args []interface{}) interface{} {
+	ctx := storage.GetContext()
+	key := args[0].([]byte)
+	storage.Delete(ctx, key)
+	return true
+}
+
+// Find returns an array of key-value pairs with key that matched the passed value.
+func Find(args []interface{}) interface{} {
+	ctx := storage.GetContext()
+	if checkArgs(args, 1) {
+		value := args[0].([]byte)
+		iter := storage.Find(ctx, value)
+		result := []string{}
+		for iterator.Next(iter) {
+			val := iterator.Value(iter)
+			key := iterator.Key(iter)
+			result = append(result, key.(string)+":"+val.(string))
+		}
+		return result
+	}
+	return false
+}
+
 func checkArgs(args []interface{}, length int) bool {
 	if len(args) == length {
 		return true