Kotlin string extension to apply https prefix to string.

StringExtension.kt

/**
 * Adds https prefix if link does not have prefix. It will also change old prefix http to https.
 * @return link/url with https prefix
 */
fun String.toHttpsPrefix(): String? = if (isNotEmpty() && !startsWith("https://") && !startsWith("http://")) {
    "https://$this"
} else if (startsWith("http://")) {
    replace("http://", "https://")
} else this

You can also specify this on the function calls:

this.isNotEmpty()

You can test it out in the Kotlin Playground

Very good, it worked perfectly here