#include <stdio.h>
#include <stdlib.h>
int main(){
char s[] = "CAO DaNG THAI NGUYEN";
//Chuyen ky tu thanh chu thuong
for (int i = 0; s[i] != '\0'; i++)
{
if (s[i] != ' ' && (s[i] >= 65 && s[i] <= 90))
s[i] = s[i] + 32;
}
return 0;
}
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