Drop CharSequence.get extension

libraries/stdlib/src/kotlin/text/Strings.kt

@@ -267,15 +267,6 @@ public val CharSequence.indices: IntRange
 public val CharSequence.lastIndex: Int
     get() = this.length - 1
 
-/**
- * Returns a character at the given index in a [CharSequence]. Allows to use the
- * index operator for working with character sequences:
- * ```
- * val c = charSequence[5]
- * ```
- */
-public operator fun CharSequence.get(index: Int): Char = this.get(index)
-
 /**
  * Returns `true` if this CharSequence has Unicode surrogate pair at the specified [index].
  */