refactor(core): fix klint errors

modules/fbs-core/api/src/main/kotlin/de/thm/ii/fbs/model/v2/checker/excel/result/ExcelCheckerResultData.kt

@@ -70,7 +70,7 @@ data class CellResultData(
     @get:JsonIgnore // Not return this information to the user
     val formula: String?,
     @get:JsonIgnore // Not return this information to the user
-    val solution: Cell?,
+    val solution: Cell?
 ) {
     constructor(cell: Cell, cellResult: CellResult?) : this(
         cell.cell,

modules/fbs-core/api/src/main/kotlin/de/thm/ii/fbs/utils/v2/spreadsheet/SpreadsheetEvaluator.kt

@@ -0,0 +1,28 @@
+package de.thm.ii.fbs.utils.v2.spreadsheet
+
+import org.apache.poi.ss.usermodel.CellType
+import org.apache.poi.ss.usermodel.FormulaEvaluator
+import org.apache.poi.ss.usermodel.Workbook
+import org.slf4j.LoggerFactory
+
+class SpreadsheetEvaluator {
+    companion object {
+        private val logger = LoggerFactory.getLogger(SpreadsheetEvaluator::class.java)
+
+        fun evaluateAll(workbook: Workbook, evaluator: FormulaEvaluator) {
+            for (sheet in workbook.sheetIterator()) {
+                for (row in sheet.rowIterator()) {
+                    for (cell in row.cellIterator()) {
+                        if (cell.cellType == CellType.FORMULA) {
+                            try {
+                                evaluator.evaluateFormulaCell(cell)
+                            } catch (e: Exception) {
+                                // Ignore Evaluation errors
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}