Change back to for loop and iterating the arrays in a reverse order
Initialize states variable with values from argv
modified ex10 program to complete an exercise
add ex11 program
add ex12 program
add exercise a for chapter 12
add exercise b for chapter 12
add exercise c for chapter 12
add ex14
refactor: get rid of the function can_print_it
refactor: change the way we find the end of a string by using strlen
function
add exercise 15 program
add exercise f for chapter 15
add first version of exercise 16