fixed bug in checkColPlacement method. was causing additional incorrect column values to be added to each columns value array

controllers/sudoku-solver.js

@@ -47,19 +47,23 @@ class SudokuSolver {
 
         const columnKeys = Object.keys(columns);
 
-        columnKeys.forEach((n, i) => {
+        columnKeys.forEach((key, i) => {
 
-            columnKeys.forEach((key, j) => {
+            let values = []
+
+            columnKeys.forEach((n, j) => {
 
                 const start = j + (9 * i)
                 const end = start + 1;
                 
                 const columnValue = puzzleString.slice(start, end);
 
-                columns[key].push(columnValue);
+                values.push(columnValue);
     
             });
 
+            columns[key] = values;
+
         });
 
         // get column values for placement