extracted a function to utils

cpp/src/model/board/board.cpp

@@ -3,6 +3,7 @@
 #include "../pieces/piece.hpp"
 #include "../utils/coords.hpp"
 #include "../utils/move.hpp"
+#include "../utils/utils.hpp"
 
 #include <algorithm>
 #include <cctype>
@@ -277,13 +278,6 @@ int8_t Board::get_king_of(int8_t colour) const {
     );
 }
 
-std::vector<int8_t> to_target_square(std::vector<Move> moves) {
-    std::vector<int8_t> ret;
-    for (Move move : moves)
-        ret.push_back(move.target_square);
-    return ret;
-}
-
 bool Board::is_check_for(int8_t colour) const {
     int8_t king_idx = this->get_king_of(colour);
     for (int i = 0; i < 64; i++) {

cpp/src/model/utils/utils.cpp

@@ -0,0 +1,8 @@
+#include "utils.hpp"
+
+std::vector<int8_t> to_target_square(std::vector<Move> moves) {
+    std::vector<int8_t> ret;
+    for (Move move : moves)
+        ret.push_back(move.target_square);
+    return ret;
+}

cpp/src/model/utils/utils.hpp

@@ -0,0 +1,8 @@
+#pragma once
+
+#include "move.hpp"
+
+#include <cstdint>
+#include <vector>
+
+std::vector<int8_t> to_target_square(std::vector<Move>);