merged from master and relocate headers inside srcs

srcs/utils.cpp

@@ -29,3 +29,26 @@ std::string	itos(int n)
 	return ( strs.str() );
 }
 
+bool	isNumeric(std::string str)
+{
+	for (size_t i = 0; i < str.length(); i++)
+	{
+		if (std::isdigit(str[i]) == false)
+			return false;
+	}
+	return true;
+}
+
+bool	isNumeric_btw(int low, int high, std::string str)
+{
+	for (size_t i = 0; i < str.length(); i++)
+	{
+		if (std::isdigit(str[i]) == false)
+			return false;
+	}
+	int n = std::atoi(str.c_str());
+	if (n < low || n > high)
+		return false;
+	return true;
+}
+