add

Author: Bascy6

app/src/main/java/hexlet/code/schemas/MapSchema.java

@@ -28,9 +28,11 @@ public boolean isValid(Object value) {
             return false;
         }
         Map<?, ?> map = (Map<?, ?>) value;
+
         if (requiredSize != -1 && map.size() != requiredSize) {
             return false;
         }
+
         if (schemas != null) {
             for (Map.Entry<String, BaseSchema<?, ?>> entry : schemas.entrySet()) {
                 String key = entry.getKey();
@@ -40,6 +42,7 @@ public boolean isValid(Object value) {
                 }
             }
         }
+
         return true;
     }
 }

app/src/main/java/hexlet/code/schemas/NumberSchema.java

@@ -18,12 +18,15 @@ public NumberSchema range(int min, int max) {
 
     @Override
     public boolean isValid(Object value) {
+
         if (isRequired && value == null) {
             return false;
         }
+
         if (value == null) {
             return true;
         }
+
         if (!(value instanceof Integer)) {
             return false;
         }

app/src/main/java/hexlet/code/schemas/StringSchema.java

@@ -16,12 +16,15 @@ public StringSchema contains(String substring) {
 
     @Override
     public boolean isValid(Object value) {
+
         if (isRequired && value == null) {
             return false;
         }
+
         if (value == null) {
             return true;
         }
+
         if (!(value instanceof String)) {
             return false;
         }