Implement userctl user registering

src/path.c

@@ -0,0 +1,27 @@
+#define build_path(url, first, ...) build_path_((url), (first), __VA_ARGS__, NULL)
+static Noh_String build_path_(bool url, Noh_String_View *first, ...) {
+    va_list args;
+    Noh_String_View *elem_ = first;
+    va_start(args, first);
+    bool start = true;
+    Noh_String result = {0};
+    if (url) noh_string_append_cstr(&result, "/");
+
+    while (elem_ != NULL) {
+        Noh_String_View elem = *elem_;
+        while (elem.count > 0) {
+            Noh_String_View 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, Noh_String_View *);
+    }
+    va_end(args);
+
+    return result;
+}