diff --git a/src/main/c/VierGewinnt.c b/src/main/c/VierGewinnt.c
index 043054e..000a60e 100644
--- a/src/main/c/VierGewinnt.c
+++ b/src/main/c/VierGewinnt.c
@@ -133,3 +133,8 @@ void clearScreen() {
     system("clear");
 #endif
 }
+
+// Write isColumnFull function
+int isColumnFull(char board[ROWS][COLS], int col) {
+    return (board[0][col] != ' ');
+}