Add special VAT number formatting with custom spacing

- Added formatVatNumber() method for special VAT number formatting
- Space between every character
- 3 extra spaces after first 2 characters
- 43 extra spaces after first 4 characters
- Example: FR85489417469 → F R   8 5                                           4 8 9 4 1 7 4 6 9
- Handles edge cases like empty or short VAT numbers
- Cleans input by removing non-alphanumeric characters and converting to uppercase

core/class/declarationtva_pdf.class.php

@@ -302,7 +302,7 @@ class DeclarationTVA_PDF
         
         $field_data['company_siret'] = $this->formatSiret($siret_value);
         
-        $field_data['company_vat_number'] = $mysoc->tva_intra; // VAT number
+        $field_data['company_vat_number'] = $this->formatVatNumber($mysoc->tva_intra); // VAT number
         $field_data['declaration_period_start'] = dol_print_date($declaration->start_date, 'day');
         $field_data['declaration_period_end'] = dol_print_date($declaration->end_date, 'day');
         $field_data['declaration_number'] = $declaration->declaration_number;
@@ -1107,4 +1107,46 @@ class DeclarationTVA_PDF
         
         return $formatted_main . $formatted_last;
     }
+
+    /**
+     * Format VAT number with special spacing
+     * Adds space between every character, with 3 spaces after first 2 chars and 43 spaces after first 4 chars
+     *
+     * @param string $vat_number VAT number
+     * @return string Formatted VAT number
+     */
+    private function formatVatNumber($vat_number)
+    {
+        // Remove any existing spaces or special characters
+        $vat_number = preg_replace('/[^A-Z0-9]/', '', strtoupper($vat_number));
+        
+        // If VAT number is not configured or too short, return as is
+        if (empty($vat_number) || strlen($vat_number) < 4) {
+            return $vat_number;
+        }
+        
+        $result = '';
+        $length = strlen($vat_number);
+        
+        for ($i = 0; $i < $length; $i++) {
+            $result .= $vat_number[$i];
+            
+            // Add space between every character
+            if ($i < $length - 1) {
+                $result .= ' ';
+            }
+            
+            // After first 2 characters, add 3 extra spaces
+            if ($i == 1) {
+                $result .= '   ';
+            }
+            
+            // After first 4 characters, add 43 extra spaces
+            if ($i == 3) {
+                $result .= str_repeat(' ', 43);
+            }
+        }
+        
+        return $result;
+    }
 }