remove pkg directory;

remove build directory;
remove githook directory;

core/utils/utils_test.go

@@ -0,0 +1,36 @@
+package utils
+
+import (
+	"testing"
+)
+
+func TestCompareGoVersion(t *testing.T) {
+	targetVersion := "go1.8"
+	if compareGoVersion("go1.12.4", targetVersion) != 1 {
+		t.Error("should be 1")
+	}
+
+	if compareGoVersion("go1.8.7", targetVersion) != 1 {
+		t.Error("should be 1")
+	}
+
+	if compareGoVersion("go1.8", targetVersion) != 0 {
+		t.Error("should be 0")
+	}
+
+	if compareGoVersion("go1.7.6", targetVersion) != -1 {
+		t.Error("should be -1")
+	}
+
+	if compareGoVersion("go1.12.1rc1", targetVersion) != 1 {
+		t.Error("should be 1")
+	}
+
+	if compareGoVersion("go1.8rc1", targetVersion) != 0 {
+		t.Error("should be 0")
+	}
+
+	if compareGoVersion("go1.7rc1", targetVersion) != -1 {
+		t.Error("should be -1")
+	}
+}