getting file descriptor from a stream, and using lseek()
adding buildroot git repo
adding more packages
ex5d_show_all_possible_concencated_words.c
adding buildroot
removing buildroot git repo and untarring buildroot files
adding buildroot packages for arm ISA
 pre-set to $make qemu_arm_versatile_defconfig
making buildroot self-contained
adding double linkedlist example
incomplete: ex5e_show_all_number_combinations.c
doing with searching on the linkedlist
fixing ex5e_show_all_number_combinations.c