A problem occurred when run build file build.gradle

[laraws]

The error result is :

Build file '/var/java-projects/algs4/build.gradle' line: 81

A problem occurred evaluating root project 'algs4'.
> Cannot add task 'wrapper' as a task with that name already exists.

[hezhigang]

in Intellij IDEA, have some little changes to build.gradle

wrapper {
  gradleVersion = '6.6.1'
}

and it run OK then.

seemed should use gradle 2.6 or later

I had created a PR#96 to fix it.