--- a/src/chess/rules.h	Sun Nov 30 22:42:46 2025 +0100
+++ b/src/chess/rules.h	Fri Mar 27 18:11:42 2026 +0100
@@ -99,7 +99,7 @@
  * @param piece the piece to dispaly
  * @return unicode character sequence for the specified piece
  */
-unsigned char* getpieceunicode(uint8_t piece);
+char* getpieceunicode(uint8_t piece);
 
 /**
  * Checks, if a specified field is covered by a piece of a certain color.