The ornamental design for a swizzlestick, as shown and described.
FIG. 1 is a perspective view of a swizzle stick in accordance with the design of the swizzle stick;
FIG. 2 is a top view of a swizzle stick of FIG. 1 in accordance with the design;
FIG. 3 is a front view of the swizzle stick of FIG. 1 in accordance with the design, the rear view being identical to the front view;
FIG. 4 is a right-side view of the swizzle stick of FIG. 1 in accordance with the design, the left- side view being identical to the right-side view; and,
FIG. 5 is a bottom view of the swizzle stick of FIG. 1 in accordance with the design.
The broken lines in the drawings depict portions of the Swizzle Stick that form no part of the claimed design.
The ornamental design for a swizzle stick as shown and described.