Remove redundant array initializers

[juliabeliaeva]

There is a number of places in the code where the following pattern is used:

val array = Array(length) { /*initializer*/ }
for ( i in 0 until length) {
  array[i] = /*other initializer*/
}

Sometimes the first initializer creates another array, which is then thrown out in the for-cycle.
This commit fixes such places in the code.

[zaleslaw]

Yeah, there are a few places in the ancient code. When I made the first steps with the Kotlin Arrays and code practices, thanks for fixing it, I just blindly copy-pasted the old code into the new one.