[Objective-C] Remove unused characters in a NSString
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- (NSString*)removeUnusedCharacters:(NSString*)input
{
    NSCharacterSet *doNotWant = [NSCharacterSet characterSetWithCharactersInString:@"ÀÁÂÃÄâãäàÈÉÊËêëÌÍÎÏîïíÒÓÔÕÖôõöóÙÚÛÜûüùÝýñ\\|!\"£$%&/=?^+*°#§;:_`«“‘¥~‹÷´`≠¡ˆ„Ω€®™æ¨œøπ[]åß∂ƒ∞∆ªº¬@¶≤≥<>∑†©√∫˜µ…•–◊{}±¿≈⁄›‰¢’”»ı³"];
    return [[[input componentsSeparatedByCharactersInSet: doNotWant] componentsJoinedByString: @""] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
}






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