#Java, 78 bytes
String f(char[]s){String t="";for(char c:s)t+=t.contains(c+"")?"":c;return t;} A simple loop while checking the output for characters already present. Accepts input as a char[].
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#Java, 78 bytes
String f(char[]s){String t="";for(char c:s)t+=t.contains(c+"")?"":c;return t;} A simple loop while checking the output for characters already present. Accepts input as a char[].