style: add .editorconfig

.editorconfig

@@ -0,0 +1,36 @@
+# http://editorconfig.org
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+# Use 4 spaces for the Python files
+[*.py]
+indent_size = 4
+max_line_length = 80
+
+# The JSON files contain newlines inconsistently
+[*.json]
+insert_final_newline = ignore
+
+# Minified JavaScript files shouldn't be changed
+[**.min.js]
+indent_style = ignore
+insert_final_newline = ignore
+
+# Makefiles always use tabs for indentation
+[Makefile]
+indent_style = tab
+
+# Batch files use tabs for indentation
+[*.bat]
+indent_style = tab
+
+[*.md]
+trim_trailing_whitespace = false
+

main.c

@@ -218,7 +218,7 @@ short bot_choose_action(short *table, short *board, int state){
 		best_choice = rand() % ACTION_NUM;
 	}
 
-	return best_choice;
+    return best_choice;
 }
 
 int main(){