Something

#include <stdio.h>
#define MAXLEN 20

void strcat2(char *ps, char *pt);
void getline2(char *s,char *t);

int main()
{
  char t[MAXLEN];
  char s[MAXLEN];

  getline2 (s,t);

  printf ("%s",s);

  return 0;
}

void getline2(char *ps,char *pt)
{
  int i = 0, c;

  while((c = getchar() ) !=EOF){
    *pt++=c;

    if ( *--pt == '\n'){
      strcat2(ps, pt);
      i=0;
    }
  }
}




int s_index = 0;

void strcat2(char *ps,  char *pt)
{
  ps += s_index;
  while (s_index < MAXLEN && (*ps++ = *pt++) != '\n')
    s_index++;

  /* The '\0' character (0), signifies the end of a string. */
  *ps = '\0';
}