Utwórz pusty wektor w rdzy
///Creates and returns empty vector
vec![]
///Creates and returns vector of length 'l' with default value 'v'
vec![v; l] /// vec![0; 3] returns [0,0,0]
///Creates and returns vector of length 'l' with default value 'v' of datatype 'T'
vec![vT; l]; /// vec![3u8; 2] returns [3, 3]
///Creates empty vector with specific type 'T' and capacity 'c'
Vec::<T>::with_capacity(c)
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