Execute send_command and return the result
Each entity of the send_command should be passed as argument
Example:
send_command('set','key','example value');
or:
send_command('multi');
send_command('config','ResetStat'); // if command contain 2 words, they should be separated
send_command('set','a', serialize($arr));
send_command('set','b', 1);
send_command('execute');