str_expand fix

README.md

@@ -8,7 +8,10 @@ C library with collections, strings, exceptions, io...
     git clone https://timerix.ddns.net/git/Timerix/tlibc.git
     ```
 
-2. Install [cbuild](https://timerix.ddns.net/git/Timerix/cbuild) version specified in `project.config`.
+2. Install [cbuild](https://timerix.ddns.net/git/Timerix/cbuild/releases). 
+    Select latest version compatible with the one in `project.config`.
+    Example: For `2.3.0` download latest `2.3.x`.
+
 
 3. Build static library
     ```

include/tlibc/string/str.h

@@ -19,7 +19,7 @@ str s = STR("something");
 printf(FMT_str"\n", str_expand(s));
 */
 #define FMT_str "%.*s"
-#define str_expand(s) s.len, s.data
+#define str_expand(S) (S).len, (S).data
 
 /// creates str from a string literal
 #define STR(LITERAL) str_construct(LITERAL, ARRAY_LEN(LITERAL) - 1, true)