import org.jetbrains.annotations.NotNull; import org.jetbrains.annotations.Nullable; import java.io.IOException; import java.io.InputStream; import java.sql.SQLException; import java.util.Map; class Main { public static String escapeAndUnescapeSymbols(String s, StringBuilder builder) { boolean escaped = false; for (int i = 0; i < s.length(); i++) { final char ch = s.charAt(i); if (escaped) { if (ch=='n') builder.append('\n'); if (<warning descr="Condition 'escaped' is always 'true'">escaped</warning>) break; escaped = false; continue; } if (ch == '\\') { escaped = true; continue; } builder.append(ch); } return builder.toString(); } }