#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "myString.h"

#define ES_LETRA(x) (('a' <= (x) && (x) <= 'z') || ('A' <= (x) && (x) <= 'Z'))
#define MAYUSCULA(x) (('a' <= (x) && (x) <= 'z') ? ((x)-'a'+'A') : (x))
#define MINUSCULA(x) (('A' <= (x) && (x) <= 'Z') ? ((x)-'A'+'a') : (x))
#define ES_FINAL(x) ((x) == '\0')

///Devuelve primera aparición de ch
char *str_chr(const char *cadena, int ch)
{
    char *str = (char*)cadena;

    while(*str != '\0')
    {
        if(*str == ch)
        {
            return str;
        }
        str++;
    }

    return NULL;
}

char *normalizar(const char *cad)
{
    char *str = malloc(sizeof(char)*strlen(cad));
    char *inicio = str;

    ///Saltar todos los carácteres inválidos al inicio
    while(*cad && *cad == ' ')
        cad++;

    int primerPalabra = 1;
    int comaEncontrada = 0;

    while(*cad)
    {
        int primerLetra = 1;
        while(*cad && ES_LETRA(*cad))
        {
            if(!primerPalabra && primerLetra == 1)
            {
                *str = ' ';
                str++;
            }

            if(primerLetra)
                *str = MAYUSCULA(*cad);
            else
                *str = MINUSCULA(*cad);

            str++;
            cad++;

            primerLetra = 0;
        }
        primerPalabra = 0;

        while(*cad && (*cad == ' ' || *cad == ','))
        {
            if(*cad == ',' && !comaEncontrada)
            {
                comaEncontrada = 1;
                *str = ',';
                str++;
            }
            cad++;
        }
    }

    *str = '\0';

    return inicio;
}