Removed PUBLIC and PRIVATE, corrected some examples and new test

tests/README.md

@@ -0,0 +1,7 @@
+# Tests
+
+* `sep/main.c`, `sep/sep.c` and `sep/sep.h` - Tests separate header and source compilation;
+* `contains.c` - Tests the `contains` function for all collections;
+* `foreach.c` - Tests the ForEach macros for all collections;
+* `iterators.c` - Tests all collection's iterators;
+* `pointertype.c` - Tests if the source code is compatible with pointer types.