Defining messages for the Redis queue
To support multiple tasks, we must do a two-step approach to packaging our tasks to be inserted into the Redis queue. This means that we will serialize the task struct into Vec<u8>, then add this vector of bytes to another struct that has a field denoting what type of task is in the message. We can define this process by first importing the Serialize and Deserialize traits in the src/tasks/mod.rs file with the following code:
use serde::{Serialize, Deserialize};
We can then define the enum task type and message struct with the following code:
#[derive(Debug, Clone, Serialize, Deserialize)]
use add::AddTask;
use multiply::MultiplyTask;
use subtract::SubtractTask;
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum TaskType {
    ADD(AddTask),
    MULTIPLY(MultiplyTask),
    SUBTRACT(SubtractTask)
}
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TaskMessage...
