개형문자, 대소문자

#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <ctype.h>

void noMoreNewline(char* theString){
char * isANewline;

isANewline = strrchr(theString, '\n');

// 개형문자
if(isANewline){
*isANewline = '\0';
}
}

void makeLowercase(char* theString){
int i = 0;

while(theString[i]){
// 소문자 변경
theString[i] = tolower(theString[i]);
// 대문자 변경
// theString[i] = toupper(theString[i]);
i++;
}
}

int main(void){
char doYouWantToQuit[10];

printf("Enter quit to quit: ");

fgets(doYouWantToQuit, 10, stdin);

noMoreNewline(doYouWantToQuit);

makeLowercase(doYouWantToQuit);

printf(doYouWantToQuit);

while(strcmp(doYouWantToQuit, "quit")){
printf("Enter quit to quit: ");
fgets(doYouWantToQuit, 10, stdin);
noMoreNewline(doYouWantToQuit);
makeLowercase(doYouWantToQuit);

}

printf("Thank you for typing quit %s\n\n", doYouWantToQuit);

}