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pub trait Convert {
    fn to_2_array(&self) -> [u8; 2];
    fn to_4_array(&self) -> [u8; 4];
    fn to_8_array(&self) -> [u8; 8];
    fn to_16_array(&self) -> [u8; 16];
}

impl Convert for Vec<u8> {
    fn to_2_array(&self) -> [u8; 2] {
        let mut output = [0u8; 2];
        for i in 0..2 {
            output[i] = self[i];
        }
	output
    }
    fn to_4_array(&self) -> [u8; 4] {
        let mut output = [0u8; 4];
        for i in 0..4 {
            output[i] = self[i];
        }
        output
    }
    fn to_8_array(&self) -> [u8; 8] {
        let mut output = [0u8; 8];
        for i in 0..8 {
            output[i] = self[i];
        }
        output
    }
    fn to_16_array(&self) -> [u8; 16] {
        let mut output = [0u8; 16];
        for i in 0..16 {
            output[i] = self[i];
        }
        output
    }
}