Check error for file.Close().

helpers.go

@@ -35,12 +35,15 @@ func readFile(path string) (*bytes.Buffer, error) {
 	if err != nil {
 		return nil, err
 	}
-	defer file.Close()
 	buffer := new(bytes.Buffer)
 	_, err = buffer.ReadFrom(file)
 	if err != nil {
 		return nil, err
 	}
+	err = file.Close()
+	if err != nil {
+		fmt.Println(" error while closing file:", err)
+	}
 	return buffer, nil
 }