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

// Finds the next alpha sequence
// @length, the length of the alpha string,
// @returns the pointer to the start of the string.
static const char* 
find_alpha_str(const char* string, long* length) {
  int on = 0;
  const char* start = NULL;
  while(*string)
  {
    if(on)
    {
      if(!isalpha(*string)) return start;
      else *length += 1;
    }
    else
    {
      if(isalpha(*string))
      {
        on = 1;
        *length = 1;
        start = string;
      }
    }
    string++;
  }
  return start;
}

int main(void) {
  long le = 0;
  const char * result = find_alpha_str(" \n\nfdsf", &le);
  printf("length of alpha is %ld, str is %s\n", le, result);
  return 0;
}