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Converting uppercase to lowercase

#include <stdio.h> int main(void) {   char letter = 'B';                           if(letter >= 'A')                            if (letter <= 'Z'){                                            letter = letter - 'A'+ 'a';                printf("You entered an uppercase %c\n", letter);     }     else                                         printf("Try using the shift key, Bud! I want a capital letter.\n");   return 0; } You entered an uppercase b