static String text = "This is a copy pasta text";

// This block of code finds spaces in a sentence. Like a total space in text for Example: 8.
       for (n=0,m=0; n<text.length(); n++) {
            char ch = text.charAt(n);

            if (ch == ' ') {
                m++;
        }
}
// This block of code finds indexes at spaces. Like [4, 7, 9, 14, 20]
while ((index = text.indexOf(' ',index+1)) >0) {
            add.add(index);
            builder.setCharAt(index,chars(charss));

        }

// This block of code stores emojis in an array. Like [😂, 😊, 😉, 😳, 😃]
for (int v=0; v<m; v++){
           String s = EmojiParser.parseToUnicode(pickRandomEmoji(emojiNames));
           f.add(s);
       }

// I want input something like this ==> This😂is😊a😉copy😳pasta😃text.