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#include "rot13.h"
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void rot13(char* in)
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{
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char* end = in + strlen(in);
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for (char* c = in; c < end; c++) {
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if (*c >= 'a' && *c <= 'z') {
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*c += (*c < 'n') ? 13 : -13;
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continue;
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}
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if (*c >= 'A' && *c <= 'Z') {
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*c += (*c < 'N') ? 13 : -13;
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}
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}
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}
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