Linting issues and prerequisites updated in config.json

concepts/nullability/about.md

@@ -4,7 +4,7 @@ In Java, the [`null` literal][null-keyword] is used to denote the absence of a v
 
 [Primitive variables][primitive-data-types] in java all have a default value and therefore can never be `null`. By convention they start with a lowercase letter e.g `int`
 
-[Reference variables][reference-data-types] contain the memory address of an object and can 
+[Reference variables][reference-data-types] contain the memory address of an object and can
 have a value of null. These variables usually start with an uppercase e.g `String`
 
 Attempting to assign a primitive variable a value of `null` will result in a compile time error as the variable always holds
@@ -30,6 +30,7 @@ int[] arr = null;
 // Throws NullPointerException at runtime
 arr.Length;
 ```
+
 A [`NullPointerException` is thrown][null-pointer-exception] when trying to access a reference variable which is null but requires an object.
 
 To safely work with nullable values, one should check if they are `null` before working with them which can be done using [equality operators][equality-operators] such as `==` or `!=`:
@@ -49,4 +50,3 @@ if(arr != null) {
 [reference-data-types]: https://docs.oracle.com/javase/specs/jls/se7/html/jls-4.html#jls-4.3
 [null-pointer-exception]: https://docs.oracle.com/javase/8/docs/api/java/lang/NullPointerException.html
 [equality-operators]: https://docs.oracle.com/javase/tutorial/java/nutsandbolts/op2.html
-

concepts/nullability/introduction.md

@@ -20,4 +20,4 @@ Assigning a reference variable a `null` value will not result in a compile time
 ```java
 //No error will occur as the String variable str is nullable
 String str = null;
-```
+```

config.json

@@ -243,7 +243,7 @@
           "nullability"
         ],
         "prerequisites": [
-          "if-statements",
+          "if-else-statements",
           "strings"
         ]
       }

exercises/concept/tim-from-marketing/.docs/hints.md

@@ -1,18 +1,20 @@
 # Hints
 
 ## 1. Print a badge for an employee
+
 - [String interpolation][string-interpolation] can be used to create description strings.
 - There is a [built-in method to convert a string to uppercase][to-upper-case].
 
 ## 2. Print a badge for a new employee
+
 - You should check if the ID is `null` before using it.
 - You can use the [equality operators][equality-operators] to compare the value to `null`
 
 ## 3. Print a badge for the owner
+
 - You should check if the department is `null` before using it.
 - You can use the [equality operators][equality-operators] to compare the value to `null`
 
-
 [string-interpolation]: https://www.baeldung.com/java-string-interpolation
 [to-upper-case]:https://docs.oracle.com/javase/8/docs/api/java/lang/String.html#toUpperCase--
-[equality-operators]: https://docs.oracle.com/cd/E21764_01/apirefs.1111/e17787/com/sigmadynamics/util/Null.html#isNull_java_lang_String_
+[equality-operators]: https://docs.oracle.com/cd/E21764_01/apirefs.1111/e17787/com/sigmadynamics/util/Null.html#isNull_java_lang_String_

exercises/concept/tim-from-marketing/.docs/instructions.md

@@ -40,4 +40,4 @@ Note that it is possible for the owner to also be a new employee:
 Badge badge = new Badge();
 badge.print(id: null, "Charlotte Hale", department: null);
 // => "Charlotte Hale - OWNER"
-```
+```

exercises/concept/tim-from-marketing/.docs/introduction.md

@@ -22,4 +22,4 @@ Assigning a reference variable a `null` value will not result in a compile time
 ```java
 //No error will occur as the String variable str is nullable
 String str = null;
-```
+```