The ornamental design for a walkingcane, as shown and described.
FIG. 1 is a perspective view of the walking cane showing my new design;
FIG. 2 is a perspective view thereof from another angle;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof; and,
FIG. 9 is an enlarged view of a portion indicated with numeric 9 in FIG. 1.
The broken lines shown in the drawings are included for the purpose of illustrating portions of the walking cane that form no part of the claimed design. The solid waved lines shown in FIGS. 1-6 depict symbolic break lines and form no part of the claimed design.