imc_text_form_field.dart

 TextEditingController _weightController = TextEditingController();
 TextEditingController _heightController = TextEditingController();
  
  TextFormField buildTextFormField({TextEditingController controller, String error, String label}) {
    return TextFormField(
      keyboardType: TextInputType.number,
      decoration: InputDecoration(labelText: label),
      controller: controller,
      validator: (text) {
        return text.isEmpty ? error : null;
      },
    );
  }