Fix trim on properties.

src/main/kotlin/TableParser.kt

@@ -125,7 +125,7 @@ class TableParser(private val step: String) {
             if (count <= metadata.tableHeaderCount) {
                 if (count == metadata.tableHeaderIndex) {
                     headerProperties = line
-                    headerProperties.forEachIndexed { index, property ->
+                    headerProperties = headerProperties.mapIndexed { index, property ->
                         val trimmedProperty = property.trim()
                         if (trimmedProperty.isEmpty()) {
                             throw InvalidInputException(
@@ -137,6 +137,7 @@ class TableParser(private val step: String) {
                                 "Invalid property name $trimmedProperty on row $count in column ${index + 1}! You may not use the any of the following characters: + , . "
                             )
                         }
+                        trimmedProperty
                     }
                 }
                 continue