Replace Char with String

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using System;
using System.Text;
public class MainClass {
static String ReplaceCharString(String s, char c1, String s2) {
StringBuilder res = new StringBuilder();
for (int i = 0; i < s.Length; i++) if (s[i] == c1) res.Append(s2); else res.Append(s[i]); return res.ToString(); } } [/csharp]