chore: import upstream snapshot with attribution

pkg/checker/zero_string.go

@@ -0,0 +1,36 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package checker
+
+// IsNotZeroString check s is not empty string and is not "0"
+func IsNotZeroString(s string) bool {
+	return len(s) > 0 && s != "0"
+}
+
+// FilterEmptyString filter empty string from string slice
+func FilterEmptyString(strs []string) []string {
+	var result []string
+	for _, str := range strs {
+		if IsNotZeroString(str) {
+			result = append(result, str)
+		}
+	}
+	return result
+}