Declare tag and content stream functions before defining as they depend on each other

src/main/c/stream/content.c

@@ -4,6 +4,9 @@
 #include "../util/hbchar.h"
 #include "../util/pipe.c"
 
+// Declare first before tag.c, as tag.c depends on it
+void hbs_content(hbu_pipe_t pipe);
+
 #include "./tag.c"
 
 void hbs_content(hbu_pipe_t pipe) {

src/main/c/stream/tag.c

@@ -7,6 +7,9 @@
 #include "../util/pipe.c"
 
 #include "./helper/tagname.c"
+// Declare first before content.c, as content.c depends on it
+void hbs_tag(hbu_pipe_t pipe);
+
 #include "./content.c"
 
 void hbs_tag(hbu_pipe_t pipe) {