numtostr 0.1.0

Converts an array of numbers to a textual string
Documentation 
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// Takes an array of unsigned ints and returns a string

pub fn numtostr(num: &[u8]) -> String {
    static ALPHABET: [char; 26] = [
        'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r',
        's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
    ];
    let mut numarray = num.to_owned();
    let mut newstring = String::from("");

    if numarray.len() % 2 != 0 {
        numarray.pop();
    }

    for split in numarray.chunks(2) {
        let chunkstr = format!("{}{}", split[0], split[1]);
        let mut chunknum: usize = chunkstr.parse().unwrap();
        while chunknum > 25 {
            chunknum -= 26;
        }
        newstring.push(ALPHABET[chunknum]);
    }

    return newstring;
}

#[cfg(test)]
mod tests {
    #[test]
    fn testz() {
        use numtostr;
        let num = [2,5];
        assert_eq!(numtostr(&num), String::from("z"))
    }

        #[test]
    fn testa() {
        use numtostr;
        let num = [0,0];
        assert_eq!(numtostr(&num), String::from("a"))
    }

        #[test]
    fn testdouble() {
        use numtostr;
        let num = [5,1];
        assert_eq!(numtostr(&num), String::from("z"))
    }
}