Implement userctl user registering

src/library.c

@@ -1,3 +1,5 @@
+#include "path.c"
+
 typedef struct {
     bool is_dir;
     SV name;
@@ -41,34 +43,6 @@ static void set_modified_time(Library_Entry *entry) {
     }
 }
 
-#define build_path(url, first, ...) build_path_((url), (first), __VA_ARGS__, NULL)
-static Noh_String build_path_(bool url, SV *first, ...) {
-    va_list args;
-    SV *elem_ = first;
-    va_start(args, first);
-    bool start = true;
-    Noh_String result = {0};
-    if (url) noh_string_append_cstr(&result, "/");
-
-    while (elem_ != NULL) {
-        SV elem = *elem_;
-        while (elem.count > 0) {
-            SV component = noh_sv_chop_by_delim(&elem, '/');
-            if (noh_sv_eq(component, sv(".."))) continue;
-
-            if (component.count > 0) {
-                if (start) start = false; else noh_string_append_cstr(&result, "/");
-                noh_string_append_sv(&result, component);
-            }
-        }
-
-        elem_ = va_arg(args, SV *);
-    }
-    va_end(args);
-
-    return result;
-}
-
 /**
  * Creates a Library entry from a dirent structure.
  */