Better comment structure

ex6/ex6.c

@@ -1,13 +1,15 @@
-// Write a program that will find the average time it takes for your computer
-// to make a system call an empty write to stdout. Your program should use the 
-// `clock_gettime` procedure to time how long a single system call takes. It'll 
-// do this for one million iterations, and then find the average of all of those 
-// iterations in nanoseconds.
-// For some helpful documentation and examples of using time-related system calls,
-// visit this site: https://www.cs.rutgers.edu/~pxk/416/notes/c-tutorials/gettime.html
-// While the linked site does say that `clock_gettime()` does not work on OSX, this 
-// turns out to only be the case for OSX versions < 10.12. Anything later than that 
-// and `clock_gettime()` should work just fine. 
+/*
+Write a program that will find the average time it takes for your computer
+to make a system call an empty write to stdout. Your program should use the 
+`clock_gettime` procedure to time how long a single system call takes. It'll 
+do this for one million iterations, and then find the average of all of those 
+iterations in nanoseconds.
+For some helpful documentation and examples of using time-related system calls,
+visit this site: https://www.cs.rutgers.edu/~pxk/416/notes/c-tutorials/gettime.html
+While the linked site does say that `clock_gettime()` does not work on OSX, this 
+turns out to only be the case for OSX versions < 10.12. Anything later than that 
+and `clock_gettime()` should work just fine. 
+*/
 
 #include <stdio.h>
 #include <unistd.h>