fixed mixed declarations and code.

logic adjustments for print array

in quick_sort, added missing semicolon after i++, added missing size argument to print calls.

quick_sort compares the i position and pivot. if right is greater switches i and k, increments i. if not increments k and swaps i and pivot.

in selection_sort added space around - line 19

added best, average and worst case performance notation for O-2

in selection_sort, added conditional check before swap and print. k = 1+2, i++.

in insertion_sort, removed trailing whitespace line 23.

added big O notations for time complexity to 1-O.

in insertion_sort, added missing semicolons at the end of line 18, 28. renamed 5-print_list.c

in insertion_sort, added list pointer current. changed if else in while loop to a while loop, using temp to check values backward until temp = list pointer. then current = current->next.

in insertion sort, added documentation, null check for empty list, while loop with if else value comparison and swap.

changed spaces to tabs in header

in print_array.c changed spaces to tabs. In 0-O corrected 0s to Os.

in bubble_sort, added documentation. changed int i to size_t to compare against size.