let user_credentials = [
    "email": "abc123@gmail.com",
    "password": "123456"
] as [String:String]

let validationhelper = ValidationHelper()
do {
    let email = try validationhelper.validation(stringForValidation: user_credentials["email"], typeOfValidation: .email)
    let password = try validationhelper.validation(stringForValidation: user_credentials["password"], typeOfValidation: .pswd_general)
    print("Email: ", email, "Password: ", password)

    //  ...Handle login/create account functionality

} catch {
    print(error)

    //  ...Show alert with error as a message.
}