Cleanup in core modules

core/util.runtime/src/org/jetbrains/kotlin/utils/SmartSet.kt

@@ -61,7 +61,7 @@ class SmartSet<T> private constructor() : AbstractSet<T>() {
                 val arr = data as Array<T>
                 if (e in arr) return false
                 data = if (size == ARRAY_THRESHOLD - 1) linkedSetOf(*arr).apply { add(e) }
-                else Arrays.copyOf(arr, size + 1).apply { set(size() - 1, e) }
+                else Arrays.copyOf(arr, size + 1).apply { set(size - 1, e) }
             }
             else -> {
                 val set = data as MutableSet<T>

core/util.runtime/src/org/jetbrains/kotlin/utils/capitalizeDecapitalize.kt

@@ -23,13 +23,13 @@ package org.jetbrains.kotlin.util.capitalizeDecapitalize
  */
 public fun String.decapitalizeSmart(asciiOnly: Boolean = false): String {
     fun isUpperCaseCharAt(index: Int): Boolean {
-        val c = charAt(index)
+        val c = this[index]
         return if (asciiOnly) c in 'A'..'Z' else c.isUpperCase()
     }
 
     if (isEmpty() || !isUpperCaseCharAt(0)) return this
 
-    if (length() == 1 || !isUpperCaseCharAt(1)) {
+    if (length == 1 || !isUpperCaseCharAt(1)) {
         return if (asciiOnly) decapitalizeAsciiOnly() else decapitalize()
     }
 
@@ -49,7 +49,7 @@ public fun String.capitalizeFirstWord(asciiOnly: Boolean = false): String {
     fun toUpperCase(string: String) = if (asciiOnly) string.toUpperCaseAsciiOnly() else string.toUpperCase()
 
     fun isLowerCaseCharAt(index: Int): Boolean {
-        val c = charAt(index)
+        val c = this[index]
         return if (asciiOnly) c in 'a'..'z' else c.isLowerCase()
     }
 
@@ -60,7 +60,7 @@ public fun String.capitalizeFirstWord(asciiOnly: Boolean = false): String {
 
 public fun String.capitalizeAsciiOnly(): String {
     if (isEmpty()) return this
-    val c = charAt(0)
+    val c = this[0]
     return if (c in 'a'..'z')
         c.toUpperCase() + substring(1)
     else
@@ -69,7 +69,7 @@ public fun String.capitalizeAsciiOnly(): String {
 
 public fun String.decapitalizeAsciiOnly(): String {
     if (isEmpty()) return this
-    val c = charAt(0)
+    val c = this[0]
     return if (c in 'A'..'Z')
         c.toLowerCase() + substring(1)
     else
@@ -77,7 +77,7 @@ public fun String.decapitalizeAsciiOnly(): String {
 }
 
 public fun String.toLowerCaseAsciiOnly(): String {
-    val builder = StringBuilder(length())
+    val builder = StringBuilder(length)
     for (c in this) {
         builder.append(if (c in 'A'..'Z') c.toLowerCase() else c)
     }
@@ -85,7 +85,7 @@ public fun String.toLowerCaseAsciiOnly(): String {
 }
 
 public fun String.toUpperCaseAsciiOnly(): String {
-    val builder = StringBuilder(length())
+    val builder = StringBuilder(length)
     for (c in this) {
         builder.append(if (c in 'a'..'z') c.toUpperCase() else c)
     }