toTitleCase

inline fun Char.toTitleCase(): Char(source)

fun main() {
    val lowerChar: Char = 'k'
    val titleChar: Char = lowerChar.toTitleCase()
    println(titleChar)          // Output: K

    // Convert a whole string to title case
    val text = "kotlin"
    val titleText = text.map { it.toTitleCase() }.joinToString("")
    println(titleText)          // Output: Kotlin
}