We fixed a segmentation fault for in the string

.gitignore

@@ -30,5 +30,5 @@ stamp-h1
 *.gcno
 coverage
 lcov.info
-
+.version.h
 *~

aroop/compiler/.gitignore

@@ -1,4 +1,5 @@
 valac
+aroopc
 *.h
 *.c
 Makefile

aroop/core/inc/core/txt.h

@@ -159,7 +159,7 @@ aroop_txt_t*xultb_subtxt(aroop_txt_t*src, int off, int width, aroop_txt_t*dest);
 
 #define aroop_txt_equals_static(x,static_y) ({char static_text[] = static_y;((x) && (x)->len == (sizeof(static_y)-1) && !memcmp((x)->str, static_text,(x)->len));})
 #define aroop_txt_equals_chararray(x,y) ({((!(x) && !(y)) || ((x) && !(x)->str && !(y) )) || ((x) && !strcmp((x)->str, y));})
-#define aroop_txt_zero_terminate(x) ({if((x)->len < (x)->size && (x)->str != NULL) (x)->str[(x)->len] = '\0';})
+#define aroop_txt_zero_terminate(x) ({if((x)->len < (x)->size && (x)->str != NULL && (x)->str[(x)->len] != '\0') (x)->str[(x)->len] = '\0';})
 #define aroop_txt_is_zero_terminated(x) ({((x)->len < (x)->size && (x)->str != NULL && (x)->str[(x)->len] == '\0');})
 
 #define aroop_txt_printf(x, ...) ({(x)->len = snprintf((x)->str, (x)->size - 1, __VA_ARGS__);})