Refine log message

Rework c03e14b to avoid an extra empty space in log message

See gh-3033

Author: snicoll

spring-boot/src/main/java/org/springframework/boot/context/config/ConfigFileApplicationListener.java

@@ -391,9 +391,9 @@ private PropertySource<?> loadIntoGroup(String identifier, String location,
 			StringBuilder msg = new StringBuilder();
 			msg.append(propertySource == null ? "Skipped " : "Loaded ");
 			msg.append("config file ");
-			msg.append("'" + location + "' ");
-			msg.append(StringUtils.hasLength(profile) ? "for profile " + profile : "");
-			msg.append(resource == null || !resource.exists() ? " resource not found" : "");
+			msg.append("'").append(location).append("' ");
+			msg.append(StringUtils.hasLength(profile) ? "for profile " + profile : " ");
+			msg.append(resource == null || !resource.exists() ? "resource not found" : "");
 			this.debug.add(msg);
 
 			return propertySource;