void setup() {
 Serial.begin(9600);
 while (!Serial) {}
 // this code should remove all occurrences of "narf" from the string
 String s = "narf";
 Serial.println();
 Serial.print("input: (");
 Serial.print(s);
 Serial.println(")");
 s.replace("narf", "");
 Serial.print("result: (");
 Serial.print(s);
 Serial.println(")");
 s = "narf narf";
 Serial.println();
 Serial.print("input: (");
 Serial.print(s);
 Serial.println(")");
 s.replace("narf", "");
 Serial.print("result: (");
 Serial.print(s);
 Serial.println(")");
}
void loop() {}

input: (narf)
result: ()
input: (narf narf)
result: (narf narf)

		while ((foundAt = strstr(readFrom, find.buffer)) != NULL) {
			readFrom = foundAt + find.len;
			diff = 0 - diff;
			size -= diff;
		}