Leetcode in Java && Oracle
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#N1844. Replace All Digits with Characters
problem link

#solution
class Solution {
public String replaceDigits(String s) {
char[] ch=s.toCharArray();

for(int i=1; i<ch.length; i=i+2){
ch[i]=(char)(ch[i-1]+Character.getNumericValue(ch[i]));
}

return String.valueOf(ch);
}
}