The ornamental design for a universalnutcracker, as shown and described.
FIG. 1 is a side view of a universal nutcracker.
FIG. 2 is a front view thereof.
FIG. 3 is a back view thereof.
FIG. 4 is a bottom view thereof.
FIG. 5 is a top view thereof.
FIG. 6 is a side view thereof after it is opened, and
FIG. 7 is an enlarged perspective view thereof.
Nuts, mechanical handles, linkage and the table top are shown in broken lines as they are not part of this invention and are shown for illustrative purposes only.