public void Save(string filepath)
{
string path = filepath;
if (String.IsNullOrEmpty(Path.GetExtension(filepath)))
{
path = $"{filepath}.config";
}
_fileWrapper.CreateBackup(path);
var fi = new FileInfo(path);
string json = JsonConvert.SerializeObject(new List <VariableInfo>(_variableLookup.Values));
_fileWrapper.Write(fi.FullName, json);
}