move cocktail sort to separate package

Signed-off-by: Alexander Kuleshov <kuleshovmail@gmail.com>

sort/cocktail_sort/cocktail_sort.go

@@ -1,43 +1,28 @@
-package main
+package cocktal_sort
 
-/*
- * Cocktail sort - https://en.wikipedia.org/wiki/Cocktail_sort
- */
+import (
+	sortable "github.com/0xAX/go-algorithms/sort"
+)
 
-import "fmt"
+func Sort(data sortable.Sortable) sortable.Sortable {
+	for i := 0; i < data.Len()/2; i++ {
+		left := 0
+		right := data.Len() - 1
 
-import "github.com/0xAX/go-algorithms"
+		for left <= right {
+			if data.Less(left+1, left) {
+				data.Swap(left, left+1)
+			}
 
-func main() {
-    arr := utils.RandArray(10)
-    fmt.Println("Initial array is:", arr)
-    fmt.Println("")
-    
-    tmp   := 0
-    
-    for i := 0; i < len(arr) / 2; i++ {
-        left := 0
-        right := len(arr) - 1
-        
-        for ; left <= right ; {
-            
-            if arr[left] > arr[left + 1] {
-                tmp = arr[left]
-                arr[left] = arr[left + 1]
-                arr[left + 1] = tmp
-            }
-			
-            left++
-            
-            if arr[right - 1] > arr[right] {
-                tmp = arr[right - 1]
-                arr[right - 1] = arr[right]
-                arr[right] = tmp
-            }
+			left++
 
-            right--
-        }
-    }
-    
-    fmt.Println("Sorted array is: ", arr)
+			if data.Less(right, right-1) {
+				data.Swap(right, right-1)
+			}
+
+			right--
+		}
+	}
+
+	return data
 }

sort/cocktail_sort/cocktail_sort_test.go

@@ -0,0 +1,25 @@
+package cocktal_sort
+
+import (
+	sortable "github.com/0xAX/go-algorithms/sort"
+	"math/rand"
+	"testing"
+)
+
+func TestSort(t *testing.T) {
+	var s = make(sortable.IntSlice, 10)
+
+	for i := 0; i < 10; i++ {
+		s[i] = rand.Intn(i + 1)
+	}
+
+	Sort(&s)
+
+	for i := 0; i < 10; i++ {
+		if i != 9 {
+			if s[i] > s[i+1] {
+				t.Fatal("s[i] > s[i + 1]", s[i], s[i+1])
+			}
+		}
+	}
+}