Started to make the piece move

src/board.c

@@ -4,3 +4,16 @@ PieceColors piece_getColor(const Piece piece) { return Black & piece; }
 Piece piece_getColorlessPiece(const Piece piece) {
   return piece_getColor(piece) ^ piece;
 }
+
+uint board_getIndex(const Coordinates coords) {
+  return (8 - (coords.row + 7) % 8) * 8 - (8 - (coords.column + 7) % 8);
+}
+
+bool board_movePiece(Board board, const Coordinates from,
+                     const Coordinates to) {
+  uint from_index = board_getIndex(from);
+  uint to_index = board_getIndex(to);
+  board[to_index].piece = board[from_index].piece;
+  board[from_index].piece = -1;
+  return true;
+}

src/board.h

@@ -1,13 +1,18 @@
 #ifndef __BOARD_HEADER
 #include "common.h"
+
 typedef int Piece;
 typedef enum { Pawn = 0, Knight, Bishop, Rook, Queen, King } Pieces;
 typedef enum { White = 0, Black = 8 } PieceColors;
 
 typedef struct {
-  Piece piece;
   uint row;
   uint column;
+} Coordinates;
+
+typedef struct {
+  Piece piece;
+  Coordinates coords;
 } Square;
 
 typedef Square Board[64];
@@ -15,4 +20,6 @@ typedef Square Board[64];
 PieceColors piece_getColor(const Piece piece);
 Piece piece_getColorlessPiece(const Piece piece);
 
+bool board_movePiece(Board board, const Coordinates from, const Coordinates to);
+
 #endif // !__BOARD_HEADER

src/common.h

@@ -1,6 +1,7 @@
 #ifndef __COMMON_HEADER
 #include <stdbool.h>
 #include <stdio.h>
+
 typedef unsigned int uint;
 
 char chrToLower(char chr);

src/fen.c

@@ -1,4 +1,5 @@
 #include "fen.h"
+
 // Starter fen: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR
 void fen_toBoard(const FEN fen, Board board) {
   uint i = 0;
@@ -43,7 +44,8 @@ void fen_toBoard(const FEN fen, Board board) {
       }
       PieceColors color = is_upper_case ? White : Black;
       Piece piece = p ^ color;
-      Square square = {.piece = piece, .row = row, .column = ++column};
+      Coordinates coords = {.row = row, .column = ++column};
+      Square square = {.piece = piece, .coords = coords};
       board[board_i++] = square;
     } else if (fen_char > '0' && fen_char < '9') {
       // if the char is a number bet. 1 and 8
@@ -51,7 +53,8 @@ void fen_toBoard(const FEN fen, Board board) {
       int offset = fen_char - '0';
       if (offset < 9) {
         for (int j = 0; j < offset; j++) {
-          Square square = {.piece = -1, .row = row, .column = ++column};
+          Coordinates coords = {.row = row, .column = ++column};
+          Square square = {.piece = -1, .coords = coords};
           board[board_i++] = square;
         }
       } else {

src/main.c

@@ -2,8 +2,11 @@
 
 int main() {
   Board board;
-  FEN fen = "rnbqkbnr/ppppp1pp/5p2/8/8/8/PPPPPPPP/RNBQKBNR";
+  FEN fen = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR";
   fen_toBoard(fen, board);
+  Coordinates from = {.row = 8, .column = 3};
+  Coordinates to = {.row = 6, .column = 3};
+  board_movePiece(board, from, to);
   fen_fromBoard(board, fen);
   printf("%s", fen);
   return 0;