improve code to remove namespace

cpp-dump/hpp/class_name.hpp

@@ -85,29 +85,30 @@ inline std::string styled_classname_str(std::string_view type_name) {
   }
 
   if (options::classname_style & flags::classname_style::no_namespace) {
-    std::string no_ns;
-
-    std::reverse(styled.begin(), styled.end());
-    for (std::size_t i = 0; i < styled.size(); ++i) {
-      if (styled[i] != ':') {
-        // append class name
-        no_ns.push_back(styled[i]);
-        continue;
-      }
-
-      // skip namespace
+    auto get_namespace_end = [&](std::size_t begin) {
       int gt_count = 0;
-      for (++i; i < styled.size(); ++i) {
-        if (styled[i] == '>') {
+
+      std::size_t end;
+      for (end = begin + 1; end < styled.size(); ++end) {
+        if (styled[end] == '>') {
           ++gt_count;
-        } else if (styled[i] == '<') {
+        } else if (styled[end] == '<') {
           --gt_count;
-          if (gt_count < 0) {
-            no_ns.push_back(styled[i]);
-            break;
-          }
+          if (gt_count < 0) break;
         }
       }
+
+      return end;
+    };
+
+    std::string no_ns;
+    std::reverse(styled.begin(), styled.end());
+    for (std::size_t i = 0; i < styled.size(); ++i) {
+      if (styled[i] == ':') {
+        i = get_namespace_end(i) - 1;
+      } else {
+        no_ns.push_back(styled[i]);
+      }
     }
     std::reverse(no_ns.begin(), no_ns.end());