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+====== Trim a std::string ======
+<code cpp>
+std::string& ltrim(std::string& str, const std::string& chars = "\t\n\v\f\r ")
+{
+	str.erase(0, str.find_first_not_of(chars));
+	return str;
+}
+std::string& rtrim(std::string& str, const std::string& chars = "\t\n\v\f\r ")
+{
+	str.erase(str.find_last_not_of(chars) + 1);
+	return str;
+}
+std::string& trim(std::string& str, const std::string& chars = "\t\n\v\f\r ")
+{
+	return ltrim(rtrim(str, chars), chars);
+}
+</code>