tidy round1

util/StringUtil.cc

@@ -1,5 +1,5 @@
 // OpenSTA, Static Timing Analyzer
-// Copyright (c) 2025, Parallax Software, Inc.
+// Copyright (c) 2026, Parallax Software, Inc.
 // 
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -78,7 +78,7 @@ stringFloat(const std::string &str)
 void
 trimRight(std::string &str)
 {
-  str.erase(str.find_last_not_of(" ") + 1);
+  str.erase(str.find_last_not_of(' ') + 1);
 }
 
 StringSeq
@@ -98,4 +98,4 @@ parseTokens(const std::string &text,
   return tokens;
 }
 
-} // namespace
+} // namespace sta