Overhaul of command parsing

luprex/core/cpp/util.hpp

@@ -63,6 +63,9 @@ std::string hash_to_hex(const HashValue &hash);
 // Split a string into multiple strings
 StringVec split(const std::string &s, char sep);
 
+// Join multiple strings into one string
+std::string join(const StringVec &strs, std::string sep);
+
 // Return N repetitions of string A
 std::string repeat_string(const std::string &a, int n);