/*
 * Minio Client (C) 2015 Minio, Inc.
 *
 * Licensed 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 main

// commonPrefix returns the longest common prefix between two strings.
func commonPrefix(first, second string) string {
	if first == "" || second == "" {
		return ""
	}
	if first > second {
		// Pick the shorter one for looping.
		first, second = second, first
	}
	for i := range first {
		if first[i] != second[i] {
			return first[:i]
		}
	}
	return first
}