## What is the purpose of the change

Simplify the code of StringUtils to make it more graceful.

## Brief changelog

Modified files:
dubbo-common/src/main/java/org/apache/dubbo/common/utils/StringUtils.java
dubbo-common/src/test/java/org/apache/dubbo/common/utils/StringUtilsTest.java

New Files:
dubbo-common/src/main/java/org/apache/dubbo/common/utils/ArrayUtils.java
dubbo-common/src/test/java/org/apache/dubbo/common/utils/ArrayUtilsTest.java

[ Full content available at: 
https://github.com/apache/incubator-dubbo/pull/2740 ]
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