AddNumber 1.0.0

Add a one number to another number. Made this for class if you use this just why
Documentation 
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pub fn add(number_1: u64, number_2: u64) -> u64 {
    number_1 + number_2
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn it_works() {
        let result = add(2, 2);
        assert_eq!(result, 4);
    }
}