common/src/main/java/lighthouse/protocol/LHProtos.java
public Builder clearTitle() {
        bitField0_ = (bitField0_ & ~0x00000001);
        title_ = getDefaultInstance().getTitle();
        onChanged();
        return this;
      }
/**
       * <code>required string title = 1;</code>
       */
required string title = 1.
required string title = 1 .
public Builder clearTitle() {
        bitField0_ = (bitField0_ & ~0x00000001);
        title_ = getDefaultInstance().getTitle();
        onChanged();
        return this;
      }
public Builder clearTitle ( ) { bitField0_ = ( bitField0_ & ~ 0x00000001 ) ; title_ = getDefaultInstance ( ) . getTitle ( ) ; onChanged ( ) ; return this ; }
<code>required string title = 1;</code>
<code > required string title = 1 ; < / code >