Data Structure & Algorithm in C; Create a skeleton file following the other given files

data structure in C (Read the attached file to understand the problem statement)

KEYWORDS:
sketch.h,
sketch.c,
sketch.sk
displayfull.c
pixel location (x,y)
Single-byte commands:
TOOL to switch active line drawing on or off,
DX to move horizontally, and
DY to move vertically.
Bits of command byte;
Opcode (i.e. which of the three commands to do) and
Operand (ie. what data to do it with)
HEX