Simplify and fix code

gazebo/Arduino.h

@@ -33,17 +33,9 @@ class __FlashStringHelper;
 // https://www.arduino.cc/reference/en/language/variables/data-types/stringobject/
 class String: public std::string {
 public:
-	String(const char *str = "") : std::string(str ? str : "") {}
 	long toInt() const { return atol(this->c_str()); }
 	float toFloat() const { return atof(this->c_str()); }
 	bool isEmpty() const { return this->empty(); }
-	void toCharArray(char *buf, unsigned int bufsize, unsigned int index = 0) const {
-		strlcpy(buf, this->c_str() + index, bufsize);
-	}
-	void trim() {
-		this->erase(0, this->find_first_not_of(" \t\n\r"));
-		this->erase(this->find_last_not_of(" \t\n\r") + 1);
-	}
 };
 
 class Print;