move safemap to utils & add many helpful slice function

utils/safemap_test.go

@@ -0,0 +1,24 @@
+package utils
+
+import (
+	"testing"
+)
+
+func Test_beemap(t *testing.T) {
+	bm := NewBeeMap()
+	if !bm.Set("astaxie", 1) {
+		t.Error("set Error")
+	}
+	if !bm.Check("astaxie") {
+		t.Error("check err")
+	}
+
+	if v := bm.Get("astaxie"); v.(int) != 1 {
+		t.Error("get err")
+	}
+
+	bm.Delete("astaxie")
+	if bm.Check("astaxie") {
+		t.Error("delete err")
+	}
+}