diff --git a/builder/src/main/java/com/iluwatar/builder/Hero.java b/builder/src/main/java/com/iluwatar/builder/Hero.java
index 8cd67fc63..f92e61761 100644
--- a/builder/src/main/java/com/iluwatar/builder/Hero.java
+++ b/builder/src/main/java/com/iluwatar/builder/Hero.java
@@ -71,10 +71,10 @@ public class Hero {
     if (hairColor != null || hairType != null) {
       sb.append(" with ");
       if (hairColor != null) {
-        sb.append(hairColor).append(" ");
+        sb.append(hairColor).append(' ');
       }
       if (hairType != null) {
-        sb.append(hairType).append(" ");
+        sb.append(hairType).append(' ');
       }
       sb.append(hairType != HairType.BALD ? "hair" : "head");
     }
@@ -84,7 +84,7 @@ public class Hero {
     if (weapon != null) {
       sb.append(" and wielding a ").append(weapon);
     }
-    sb.append(".");
+    sb.append('.');
     return sb.toString();
   }
 
diff --git a/property/src/main/java/com/iluwatar/property/Character.java b/property/src/main/java/com/iluwatar/property/Character.java
index 38d78ae27..6a45d16b2 100644
--- a/property/src/main/java/com/iluwatar/property/Character.java
+++ b/property/src/main/java/com/iluwatar/property/Character.java
@@ -114,11 +114,11 @@ public class Character implements Prototype {
   public String toString() {
     StringBuilder builder = new StringBuilder();
     if (name != null) {
-      builder.append("Player: ").append(name).append("\n");
+      builder.append("Player: ").append(name).append('\n');
     }
 
     if (type != null) {
-      builder.append("Character type: ").append(type.name()).append("\n");
+      builder.append("Character type: ").append(type.name()).append('\n');
     }
 
     builder.append("Stats:\n");
@@ -127,7 +127,7 @@ public class Character implements Prototype {
       if (value == null) {
         continue;
       }
-      builder.append(" - ").append(stat.name()).append(":").append(value).append("\n");
+      builder.append(" - ").append(stat.name()).append(':').append(value).append('\n');
     }
     return builder.toString();
   }
diff --git a/step-builder/src/main/java/com/iluwatar/stepbuilder/Character.java b/step-builder/src/main/java/com/iluwatar/stepbuilder/Character.java
index e77f7430b..092993f5c 100644
--- a/step-builder/src/main/java/com/iluwatar/stepbuilder/Character.java
+++ b/step-builder/src/main/java/com/iluwatar/stepbuilder/Character.java
@@ -98,7 +98,7 @@ public class Character {
             .append(" armed with a ")
             .append(weapon != null ? weapon : spell != null ? spell : "with nothing")
             .append(abilities != null ? (" and wielding " + abilities + " abilities") : "")
-            .append(".");
+            .append('.');
     return sb.toString();
   }
 }