How to delete current characters in a string?

Question

I want to remove the characters in string and let the user to reenter it

Answer 1

Char *str = "sometaxt";

You can deal with char as array so you can say

str[5]='e';

Answer 2

Reinitialize it to an empty string "'' ☺️

Answer 3

var name = "john";

clearButton.onclick = function(){
name = "";
}

Simple, change value as empty string