problem 1

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

/* Collapse  spaces:
 * Write  a  program  that  reads  all  input  and  prints  it  transformed as
 * follows:
 • any  sequence  of  whitespace  that  does  not  contain  newline  is
   replaced  with  a single  space  character
 • whitespace  characters  immediately  before  a  newline  are  deleted.
 */

void collapseSpaces(){
  char a = ' ', b;
  while((b = getchar()) != EOF){
    if((isspace(b) == 0) || (b == ' ' && isspace(a) == 0) || (b == '\n')){
      printf("%c",b);
    }
    a = b;
  }
}

int main(){
  collapseSpaces();
  return 0;
}