Add missing function declarations, imports and exports

Author: ross-u

.prettierignore

@@ -0,0 +1 @@
+**/*.js

src/functions-and-arrays.js

@@ -32,7 +32,10 @@ function averageNumbers() {}
 // Level 2: Array of strings
 const wordsArr = ['seat', 'correspond', 'linen', 'motif', 'hole', 'smell', 'smart', 'chaos', 'fuel', 'palace'];
 
+function averageWordLength() { }
 
+// Bonus - Iteration #4.1
+function avg() {}
 
 // Iteration #5: Unique arrays
 const wordsUnique = [
@@ -117,6 +120,8 @@ if (typeof module !== 'undefined') {
     sumNumbers,
     sum,
     averageNumbers,
+    averageWordLength,
+    avg,
     uniquifyArray,
     doesWordExist,
     howManyTimes,

tests/functions-and-arrays.spec.js

@@ -4,6 +4,8 @@ const {
   sumNumbers,
   sum,
   averageNumbers,
+  averageWordLength,
+  avg,
   uniquifyArray,
   doesWordExist,
   howManyTimes,