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#include <stdio.h>
 
void Modifica(char str[]){
	int i;
	chrstr[0]=chrstr[0]-'a'+'A';
	for(i=0;str[i]!='\0';i++){
		if(str[i]==' ')
		  chrstr[i+1]=chrstr[i+1]-'a'+'A';
	}
	return;
}
int main(){
  char str[];
  printf("Frase: ");
  gets(str);
  Modifica(str);
  printf("Frase atualizada: ");
  puts(str);
  return 0;
 
}

prog.c: In function ‘Modifica’:
prog.c:5:2: error: ‘chrstr’ undeclared (first use in this function)
  chrstr[0]=chrstr[0]-'a'+'A';
  ^~~~~~
prog.c:5:2: note: each undeclared identifier is reported only once for each function it appears in
prog.c: In function ‘main’:
prog.c:13:8: error: array size missing in ‘str’
   char str[];
        ^~~
prog.c:15:3: warning: implicit declaration of function ‘gets’ [-Wimplicit-function-declaration]
   gets(str);
   ^~~~

Standard output is empty