1strchr("fooeyfooeyfoo", 'f') = "fooeyfooeyfoo" 2strrchr("fooeyfooeyfoo", 'f') = "foo" 3strchr("fooeyfooeyfoo", 'y') = "yfooeyfoo" 4strrchr("fooeyfooeyfoo", 'y') = "yfoo" 5strrchr("yfooeyfoo", 'y') = "yfoo" 6 7