enhancement 补充测试用例，调整 ElRegexUtil.normalize 方法逻辑

liteflow-core/src/main/java/com/yomahub/liteflow/util/ElRegexUtil.java

@@ -57,12 +57,13 @@ public class ElRegexUtil {
 
     /**
      * 规范化 EL
+     *
      * @param elStr
      * @return String
      */
     public static String normalize(String elStr) {
-        // 替换 EL 中多余空格，并在末尾保留分号
-        return elStr.replaceAll("\\s", "").replaceFirst(";*$", ";");
+        // 剔除 EL 中多余空格，且将单引号变为双引号，并在末尾保留一个分号
+        return elStr.replace("'", "\"").replaceAll("\\s", "").replaceFirst(";*$", ";");
     }
 
 }

liteflow-testcase-el/liteflow-testcase-el-springboot/src/test/java/com/yomahub/liteflow/test/base/BaseELSpringbootTest.java

@@ -96,6 +96,12 @@ public class BaseELSpringbootTest extends BaseTest {
 		Assertions.assertTrue(response.isSuccess());
 		// 应返回 chain2
 		Assertions.assertEquals("chain2", response.getChainId());
+
+		LiteflowResponse response1 = flowExecutor.execute2RespWithEL("t1=THEN(c, WHEN(j,k));w1 = WHEN(q, THEN(p, r)).id('w01');t2 = THEN(h, i);\n" +
+				"THEN(a,b,WHEN(t1, d, t2 ),SWITCH(x).to(m, n, w1),z);");
+		Assertions.assertTrue(response1.isSuccess());
+		// 应返回 chain5
+		Assertions.assertEquals("chain5", response1.getChainId());
 	}
 
 }