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#include <stdio.h> char *ft_strupcase(char *str) { while ( *str != 0) { if (*str >= 'A' && *str <= 'Z') { *str = *str-('A'-'a'); } str++; } return str; } int main() { char i[] = "fSuHGUIUigGS"; ft_strupcase(i); printf("%s", i); return 0; }