corrected some styling issues

Author: wumpz

src/main/java/net/sf/jsqlparser/expression/WindowOffset.java

@@ -60,7 +60,6 @@ public String toString() {
                 buffer.append(' ');
                 buffer.append(type);
             }
-            buffer.append(' ');
         } else {
             switch (type) {
                 case PRECEDING:
@@ -70,14 +69,12 @@ public String toString() {
                     buffer.append(" UNBOUNDED FOLLOWING");
                     break;
                 case CURRENT:
-                    buffer.append(" CURRENT ROW ");
+                    buffer.append(" CURRENT ROW");
                     break;
                 default:
                     break;
             }
-
         }
-
         return buffer.toString();
     }
 }

src/test/java/net/sf/jsqlparser/test/select/SelectTest.java

@@ -1025,12 +1025,12 @@ public void testAnalyticFunction16() throws JSQLParserException {
     }
 
     public void testAnalyticFunction17() throws JSQLParserException {
-        String statement = "SELECT AVG(sal) OVER (PARTITION BY deptno ORDER BY sal ROWS BETWEEN 0 PRECEDING  AND  0 PRECEDING ) AS avg_of_current_sal FROM emp";
+        String statement = "SELECT AVG(sal) OVER (PARTITION BY deptno ORDER BY sal ROWS BETWEEN 0 PRECEDING AND  0 PRECEDING) AS avg_of_current_sal FROM emp";
         assertSqlCanBeParsedAndDeparsed(statement);
     }
 
     public void testAnalyticFunction18() throws JSQLParserException {
-        String statement = "SELECT AVG(sal) OVER (PARTITION BY deptno ORDER BY sal RANGE CURRENT ROW ) AS avg_of_current_sal FROM emp";
+        String statement = "SELECT AVG(sal) OVER (PARTITION BY deptno ORDER BY sal RANGE CURRENT ROW) AS avg_of_current_sal FROM emp";
         assertSqlCanBeParsedAndDeparsed(statement);
     }