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Request the removal of unused capacity.
void shrink_to_fit();
          This performs a non-binding request to reduce capacity()
          to size(). The request may or may not be
          fulfilled.
        
          At most, linear in size().
        
If reallocation occurs, all iterators including any past-the-end iterators, and all references to characters are invalidated. Otherwise, no iterators or references are invalidated.