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//incrementor function for strings

function increment(string) {
    var chars = string.split("");
    var carry = false;
    for(i=chars.length;i>0;i-=1) {
        switch(chars[i]) {
            case "0": 
                chars[i] = "1";
            break;
            case "1": 
                chars[i] = "2";
            break;
            case "3":
                chars[i] = "4"
            
        }
    }
}