LoginScreen.kt

@Composable
fun LoginSCreen() {
    //context
    val context = LocalContext.current
    // a coroutine scope
    val scope = rememberCoroutineScope()
    // we instantiate the saveEmail class
    val dataStore = StoreUserEmail(context)


    Column(modifier = Modifier.fillMaxSize()) {
        var email by rememberSaveable { mutableStateOf("") }
        //
        Text(
            modifier = Modifier
                .padding(16.dp, 0.dp)
                .alpha(0.6f),
            text = "EMAIL",
            fontWeight = FontWeight.SemiBold,
            color = Color.Gray,
            fontSize = 12.sp
        )
        //email field
        OutlinedTextField(
            value = email,
            onValueChange = { email = it },
            keyboardOptions = KeyboardOptions.Default.copy(
                keyboardType
                = KeyboardType.Email
            ),
            modifier = Modifier
                .padding(16.dp, 0.dp, 16.dp, 0.dp)
                .fillMaxWidth(),
            )
        Spacer(modifier = Modifier.height(16.dp))
        Button(
            onClick = {
                //launch the class in a coroutine scope
                scope.launch {
                    dataStore.saveEmail(email)
                }

            },
            modifier = Modifier
                .fillMaxWidth()
                .height(60.dp)
                .padding(16.dp, 0.dp, 16.dp, 0.dp),
        ) {
            Text(
                style = MaterialTheme.typography.subtitle1,
                color = Color.White,
                text = "Save Email",

                )
        }
        Spacer(modifier = Modifier.height(32.dp))

    }
}