Fix: trailing white space and missing EOL

exercises/practice/knapsack/.docs/instructions.append.md

@@ -1,5 +1,5 @@
 The items are represented by [records](https://lfe.gitbooks.io/reference-guide/content/16.html), defined in `item.lfe`.
-Use `item-weight` to get the weight and `item-value` to get the value. 
+Use `item-weight` to get the weight and `item-value` to get the value.
 
 ```
 ;; Create an item with weight=5, value=50
@@ -10,4 +10,4 @@ Use `item-weight` to get the weight and `item-value` to get the value.
 
 ;; Get the value. Returns 50.
 (item-value item)
-```
+```

exercises/practice/knapsack/.meta/example.lfe

@@ -10,10 +10,10 @@
              (weight-value (item-weight item))
              (value-value (item-value item))
              (left-over-capacity (- capacity weight-value)))
-            (if 
+            (if
                 (< left-over-capacity 0)
                 value-without
-                (let 
+                (let
                     ((value-with
                         (+
                             (lists:nth (+ left-over-capacity 1) last-values)
@@ -22,27 +22,27 @@
 
 (defun next-values
     ([item last-values -1 acc] acc)
-    ([item last-values capacity acc] 
-        (next-values 
-            item 
-            last-values 
-            (- capacity 1) 
+    ([item last-values capacity acc]
+        (next-values
+            item
+            last-values
+            (- capacity 1)
             (cons (find-max item last-values capacity) acc))))
 
 (defun do-maximum-values
     (['() last-values capacity] (lists:last last-values))
     ([(cons item remaining) last-values capacity]
         (do-maximum-values
-            remaining 
+            remaining
             (next-values item last-values capacity '())
             capacity)))
 
 (defun maximum-value
     (('() _capacity) 0)
     ((items capacity)
-        (do-maximum-values 
+        (do-maximum-values
             items
-            (lists:duplicate 
+            (lists:duplicate
                 (+ capacity 1)
                 0)
             capacity)))

exercises/practice/knapsack/include/item.lfe

@@ -1,4 +1,4 @@
 ; This include file defines the item record used in the exercise.
 ; There shouldn't be any need to modify this file.
 
-(defrecord item weight value)
+(defrecord item weight value)

exercises/practice/knapsack/test/knapsack-tests.lfe

@@ -81,4 +81,3 @@
                 (make-item weight 118 value 229)
                 (make-item weight 120 value 240))
               750)))
-