use single quote to log values.

Double quotes were inherited from JUL log syntax

easy-rules-core/src/main/java/org/jeasy/rules/core/DefaultRuleListener.java

@@ -43,9 +43,9 @@ class DefaultRuleListener implements RuleListener {
     public void afterEvaluate(final Rule rule, final Facts facts, final boolean evaluationResult) {
         final String ruleName = rule.getName();
         if (evaluationResult) {
-            LOGGER.info("Rule ''{}'' triggered", ruleName);
+            LOGGER.info("Rule '{}' triggered", ruleName);
         } else {
-            LOGGER.info("Rule ''{}'' has been evaluated to false, it has not been executed", ruleName);
+            LOGGER.info("Rule '{}' has been evaluated to false, it has not been executed", ruleName);
         }
     }
 
@@ -56,13 +56,11 @@ class DefaultRuleListener implements RuleListener {
 
     @Override
     public void onSuccess(final Rule rule, final Facts facts) {
-        LOGGER.info("Rule ''{}'' performed successfully", rule.getName());
+        LOGGER.info("Rule '{}' performed successfully", rule.getName());
     }
 
     @Override
     public void onFailure(final Rule rule, final Facts facts, final Exception exception) {
-        if (LOGGER.isInfoEnabled()) {
-            LOGGER.info("Rule '" + rule.getName() + "' performed with error", exception);
-        }
+        LOGGER.info("Rule '" + rule.getName() + "' performed with error", exception);
     }
 }

easy-rules-core/src/main/java/org/jeasy/rules/core/DefaultRulesEngine.java

@@ -127,12 +127,12 @@ public final class DefaultRulesEngine implements RulesEngine {
             final String name = rule.getName();
             final int priority = rule.getPriority();
             if (priority > parameters.getPriorityThreshold()) {
-                LOGGER.info("Rule priority threshold ({}) exceeded at rule ''{}'' with priority={}, next rules will be skipped",
+                LOGGER.info("Rule priority threshold ({}) exceeded at rule '{}' with priority={}, next rules will be skipped",
                         parameters.getPriorityThreshold(), name, priority);
                 break;
             }
             if (!shouldBeEvaluated(rule, facts)) {
-                LOGGER.info("Rule ''{}'' has been skipped before being evaluated",
+                LOGGER.info("Rule '{}' has been skipped before being evaluated",
                     name);
                 continue;
             }