0 - 0x00-hello_world
1 - 0x01-variables_if_else_while
2 - 0x02-functions_nested_loops
3 - 0x03-debugging
4 - 0x04-more_functions_nested_loops
5 - 0x05-pointers_arrays_strings
6 - 0x06-pointer_arrays_strings
7 - 0x07-pointers_arrays_strings
8 - 0x08-recursion
9 - 0x09-static_libraries
10 - 0x0A-argc_argv
11 - 0x0B-malloc_free
12 - 0x0C-more_malloc_free
13 - 0x0D-preprocessor