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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define Max 100
void Chu_Dau(char *s);
int main()
{
	char ten[Max];
	//Nhập tên
	printf("Nhap ten: ");
	scanf_s("%s", ten);
	//Độ dài chuỗi
	int n = strlen(ten);
	printf("%s", ten[0]);
	Chu_Dau(ten);
	printf("\n");
	system("pause");
	return 0;
 
 
}
void Chu_Dau(char *s)
{
	int l = strlen(s);
	for (int i = 1; i < l; i++)
	{
		if (s[i] == ' ')
		{
			if (s[i + 1] == ' ') continue;
			else
			{
				printf("%s ", s[i + 1]);
			}
		}
	}
}

prog.c: In function ‘main’:
prog.c:11:2: warning: implicit declaration of function ‘scanf_s’ [-Wimplicit-function-declaration]
  scanf_s("%s", ten);
  ^~~~~~~
prog.c:14:11: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘int’ [-Wformat=]
  printf("%s", ten[0]);
           ^
prog.c:13:6: warning: unused variable ‘n’ [-Wunused-variable]
  int n = strlen(ten);
      ^
prog.c: In function ‘Chu_Dau’:
prog.c:32:14: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘int’ [-Wformat=]
     printf("%s ", s[i + 1]);
              ^
/home/OgvMdR/cc63pFsh.o: In function `main':
prog.c:(.text.startup+0x20): undefined reference to `scanf_s'
collect2: error: ld returned 1 exit status

Standard output is empty