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int main() {
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printf("Testing Edge Cases:\n\n");
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printf("1. Empty string operations:\n");
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char *empty = "";
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char *result1 = upper(empty);
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printf("upper('') = '%s'\n", result1);
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printf("\n2. String slicing edge cases:\n");
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char *text = "Hello";
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char *slice1 = text[0:0];
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printf("'Hello'[0:0] = '%s'\n", slice1);
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char *slice2 = text[10:20];
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printf("'Hello'[10:20] = '%s'\n", slice2);
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char *slice3 = text[3:3];
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printf("'Hello'[3:3] = '%s'\n", slice3);
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printf("\n3. Math with edge cases:\n");
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int zero = 0;
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printf("abs(0) = %d\n", abs(zero));
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printf("sqrt(0) = %d\n", sqrt(zero));
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printf("\n4. String concatenation:\n");
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char *str1 = "A";
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char *str2 = "B";
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char *concat = str1 + str2;
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printf("'A' + 'B' = '%s'\n", concat);
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printf("\n5. String search edge cases:\n");
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int pos1 = strpos("test", "xyz");
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printf("strpos('test', 'xyz') = %d\n", pos1);
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int pos2 = strpos("test", "test");
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printf("strpos('test', 'test') = %d\n", pos2);
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printf("\n6. Nested operations:\n");
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char *nested = upper(lower(upper("TeSt")));
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printf("upper(lower(upper('TeSt'))) = '%s'\n", nested);
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printf("\nAll edge cases handled safely!\n");
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return 0;
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}
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