MainActivity.kt

private fun onError(errorMessage: String) {
        /**
         * Here we pass a copy of the context as a parameter to every functions
         * of DialogUtilSolution singleton.
         * Once the function returns, the copy is popped off the stack 
         * -> no memory leak ✅
         
         * Be careful, this code will still leak if the user changes configuration while
         * the dialog is displayed because the dialog is not tied to the Activity's lifecycle upon
         * recreation. Please check "solutionfinal" package for complete solution.
         */
        DialogUtilSolution.showError(this, "News", errorMessage)
}