Rename movegen module files and make readability improvements

src/board/board.rs

@@ -2,11 +2,11 @@ use u64 as Bitboard;
 
 use crate::board::bitboard::{have_common_bit, lsb};
 use crate::board::state::State;
-use crate::movegen::attack::{
+use crate::movegen::attack_generator::{
     fetch_bishop_attacks, fetch_king_attacks, fetch_knight_attacks, fetch_pawn_attacks,
     fetch_queen_attacks, fetch_rook_attacks,
 };
-use crate::movegen::movegen::{
+use crate::movegen::move_generator::{
     bishop_pseudo_moves, king_pseudo_moves, knight_pseudo_moves, pawn_pseudo_moves,
     queen_pseudo_moves, rook_pseudo_moves,
 };
@@ -185,7 +185,7 @@ impl Board {
             return Some(at_black);
         }
 
-        return None;
+        None
     }
 
     pub fn make_move(&mut self, mv: &Move) {
@@ -256,7 +256,7 @@ impl Board {
                     move_parameters.promoted_piece,
                 ) {
                     let (own_pieces, opponent_pieces) = self.all_pieces();
-                    
+
                     opponent_pieces[captured_piece_type].bitboard |= square_to_bitboard(mv.dst);
                     own_pieces[promoted_piece_type].bitboard &= !square_to_bitboard(mv.dst);
                     own_pieces[PieceType::Pawn].bitboard |= square_to_bitboard(mv.src);
@@ -474,7 +474,7 @@ impl Color {
 mod tests {
     use crate::{
         board::fen::from_fen,
-        movegen::{attack::init_attacks, r#move::MoveType},
+        movegen::{attack_generator::init_attacks, r#move::MoveType},
     };
 
     use super::*;