#include <stdio.h>

int fold(char s[], int lim, int cpr) {
  int c, i;
  for (i=0; i < lim-1 && i<cpr && (c=getchar())!=EOF && c!='\n';) {
    /* We read the line and choose to increase or not if it is a space at the beginning
     * with this, we do not have to read the buffer, we work with the current input directly.
     */
    if (i != 0 || (c != ' ' && c != '\t')) {
      /* Remove spaces if we are at the first column, else keep it */
      s[i] = c;
      ++i;
    }
  }
  /* Once we have finished reading the buffer, check for trailing tabs and spaces and go back in the buffer to fill those. */
  for (;i > 0 && (s[i-1] == ' ' || s[i-1] == '\t'); i--);
  /* Failsafe in case if no input is given. */
  if (i > 0) {
    s[i] = '\n';
    s[i+1] = '\0';
  } else {
    s[i] = '\0';
  }
  return i;
}