Completed exercise 12
Completed exercise 13
Completed exercise 14
Completed exercise 15
Completed exercise 16
Completed exercise 17
Completed exercise 18
Completed exercise 19
Completed exercise 20
Completed exercise 21
Started exercise 22
Completed exercise 24
Completed exercise 25
Updated readme
Fixed 'sentence' spelling in 'print_first_and_last_sorted'
Downloaded exercise 26 using wget
Updated some comments
Completed exercise 26
Completed exercise 27
Completed exercise 29