public Builder clearFormat() {
                format_ = getDefaultInstance().getFormat();
                bitField0_ &= ~0x00000004;
                onChanged();
                return this;
            }
<code>optional string format = 3;</code>

@return This builder for chaining.
turms-server-common/src/main/java/im/turms/server/common/access/client/dto/model/file/File.java