modules/jooby-apitool/src/main/java/org/jooby/internal/apitool/Lambda.java
public Lambda prefix(String prefix) {
    return new Lambda(declaringClass, owner, desc, implementationName, name,
        Route.normalize(prefix + "/" + pattern), method.orElse(null), tag);
  }
public Lambda prefix(String prefix) {
    return new Lambda(declaringClass, owner, desc, implementationName, name,
        Route.normalize(prefix + "/" + pattern), method.orElse(null), tag);
  }
Creates a new lambda and set a pattern prefix.

@param prefix Prefix.
@return A new lambda.