@Override
    public String toString() {
        if (size == 0) {
            return "[]";
        }

        final StringBuilder sb = new StringBuilder(7 + size * 20);
        sb.append('[');

        Entry e = firstGroupHead.after;
        while (e != firstGroupHead) {
            sb.append(e.key).append('=').append(e.value).append(", ");
            e = e.after;
        }

        final int length = sb.length();
        sb.setCharAt(length - 2, ']');
        return sb.substring(0, length - 1);
    }
Removes all the entries whose hash code equals {@code h} and whose name is equal to {@code name}.

@return the first value inserted, or {@code null} if there is no such entry.
core/src/main/java/com/linecorp/armeria/common/StringMultimap.java