The ornamental design for a chopsticks with function of a pen, as shown and described.
FIG. 1 is a perspective view of a chopsticks with function of a pen showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a another perspective view thereof with an accessory member shown in broken lines for purposes of illustrating environment and forming no part of the clam;
FIG. 9 is a another perspective view thereof with an accessory member shown in broken lines for purposes of illustrating environment and forming no part of the clam; and,
FIG. 10 is a another perspective view thereof with an accessory member shown in broken lines for purposes of illustrating environment and forming no part of the clam.