Issue (#30) - Code refactoring.

expected/basic.out

@@ -0,0 +1,34 @@
+CREATE EXTENSION pg_stat_monitor;
+SELECT pg_stat_monitor_reset();
+ pg_stat_monitor_reset 
+-----------------------
+ 
+(1 row)
+
+select pg_sleep(.5);
+ pg_sleep 
+----------
+ 
+(1 row)
+
+SELECT 1;
+ ?column? 
+----------
+        1
+(1 row)
+
+SELECT bucket, query FROM pg_stat_monitor ORDER BY query;
+ bucket |             query              
+--------+--------------------------------
+      1 | SELECT $1
+      1 | SELECT pg_stat_monitor_reset()
+      1 | select pg_sleep($1)
+(3 rows)
+
+SELECT pg_stat_monitor_reset();
+ pg_stat_monitor_reset 
+-----------------------
+ 
+(1 row)
+
+DROP EXTENSION pg_stat_monitor;