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#include <ctype.h>
#include <string.h>
char* strupr(char* s) {
char* d;
for (d = s; *d; ++d)
*d = (char)toupper((int)*d);
return s;
}
char* strlwr(char* s) {
char* d;
for (d = s; *d; ++d)
*d = (char)tolower((int)*d);
return s;
}
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