Add column name printing method

dmnverifierapi/src/main/java/de/unikoblenz/fgbks/core/dmn/domain/vdmn/utils/VDmnFunctions.java

 package de.unikoblenz.fgbks.core.dmn.domain.vdmn.utils;
 
+import de.unikoblenz.fgbks.base.domain.Name;
 import de.unikoblenz.fgbks.core.dmn.domain.ids.RuleId;
 import de.unikoblenz.fgbks.core.dmn.domain.vdmn.VDmnColumn;
 import de.unikoblenz.fgbks.core.dmn.domain.vdmn.VDmnDecisionTable;
@@ -213,4 +214,32 @@ public class VDmnFunctions {
     }
     return clusters;
   }
+
+  /**
+   * Get the name of a column as string. If a label is present, the string of the label is returned.
+   * If the label is not present, the name is returned. If the name is not present, "[no name]" is
+   * returned.
+   *
+   * @param column the {@link VDmnColumn}
+   * @return a string, representing the "name" of the column
+   */
+  public String getColumnStringName(VDmnColumn column) {
+    Validate.notNull(column);
+    return column.getLabel().isPresent()
+        ? column.getLabel().get().toString()
+        : column.getName().orElse(new Name("[no name]")).toString();
+  }
+
+  /**
+   * Get the name of a column as string. If a label is present, the string of the label is returned.
+   * If the label is not present, the name is returned. If the name is not present, "[no name]" is
+   * returned.
+   *
+   * @param column the {@link VDmnColumn}
+   * @return a string, representing the "name" of the column + "name"
+   */
+  public String getColumnStringNameWithDoubleQuotes(VDmnColumn column) {
+    Validate.notNull(column);
+    return "\"" + getColumnStringName(column) + "\"";
+  }
 }