private void CheckVariableAvailable(string name, string nameOf, bool prefix)
{
if (Units.ContainsKey(name))
{
throw new ArgumentException(prefix ? $"The name with prefix `{name}` is already used by another unit." : $"The name `{name}` is already used by another unit.", nameOf);
}
if (Builtins.ContainsKey(name))
{
throw new ArgumentException(prefix ? $"The name with prefix `{name}` is already used a builtin variable or function." : $"The name `{name}` is already used a builtin variable or function.", nameOf);
}
}