Work with back space, my own io library

include/buffer.h

include/buffer.h~

include/cmd.h

include/mycanvas.h

include/myio.h

src/Makefile

src/first.map

src/getc.c

src/libsrc/Makefile

src/libsrc/buffer.c

src/libsrc/cmd.c

src/libsrc/mycanvas.c

src/libsrc/myio.c

src/startup.c