finish copy.c demo

c_programming/files/copy.c

@@ -11,7 +11,7 @@ int main(void)
     FILE *output = fopen("out.txt", "w");
     if (output == NULL)
     {
-        perror("Failed to open out.txt")
+        perror("Failed to open out.txt");
         fclose(input);
         return 1;
     }
@@ -25,8 +25,8 @@ int main(void)
 /*
 TODO:
 + clone: clone git repository and start working on copy.c
-- first: go through part 3 of cs50 week 4 memory section.pdf
-- make: get copy.c compiling with make
-- complete: fix all problems and ensure the demo program works as intended
-- wait: if I need to go work on another file, it will go in a wait: task.
++ first: go through part 3 of cs50 week 4 memory section.pdf
++ make: get copy.c compiling with make
++ complete: fix all problems and ensure the demo program works as intended
++ wait: if I need to go work on another file, it will go in a wait: task.
 */