Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0)

inline fun <R : Any, C : MutableCollection<in R>> CharSequence.mapNotNullTo(
    destination: C, 
    transform: (Char) -> R?
): C

Applies the given transform function to each character in the original char sequence and appends only the non-null results to the given destination.