C/Visual C - [AYUDA] Modelo de Parcial en C

#define _CRT_SECURE_NO_WARNINGS

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <math.h>

main (){

	char pal [40], pal2[40];

	int n,i,x,a=0,p=0,e=0;

	printf("Hola por favor introduzca una frase para saber si es capicua o no: ");

	gets(pal);

	n=strlen(pal);

	while (i=0, i<n,i++)

	{

		if (pal!=' ')

			i++;

		pal2[e]=pal[i];

		e++;

	}

	for (x=n-1; x>=0;x--)

	printf("\n %c \t", pal [x]);

	x=0;

	n=strlen(pal2);

	for (x=n-1; x>=0;x--){

		if (pal2[x]==pal2[a])

			p++;

			a++;

	}

	if (p==n)

		printf("\n Su palabra es capicua ");

	else

		printf("\n Su palabra NO es capicua ");

	system ("PAUSE");

}

char string[] =  "   dabale   arroz   a     la   zorra   el abad          ";

void PalindromeBis(){

	int len;

	char *a;

	char *b;

	len = strlen(string);

	a = string;

	b = a + len-1;

	for ( ;a < b ;a++, b--){

		for (; a  < b && *a == ' '; a++)

			;

		for (; b > a && *b == ' '; b--)

			;

		if ( *a != *b){

			printf("%c",  *a);

			break;

		}

	}

}

/*

*Usando While, así el profesor no se enfadará y te pondrá buena nota

*/

void Palindrome(){

	int len;

	char *a;

	char *b;

	len = strlen(string);

	a = string;

	b = a + len-1;

	while ( a < b){

		for (; a  < b && *a == ' '; a++)

			;

		for (; b > a && *b == ' '; b--)

			;

		if ( *a != *b){

			printf("%c",  *a);

			break;

		}

		a++;

		b--;

	}

}

int main(void){

	Palindrome();

	return 0;

}

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

char string[] =  "   DABALE ARROZ A LA      zorra   el Abad         ";

int Palindrome(){

	int len;

	char *start;

	char *end;

	len = strlen(string);

	start = string;

	end = start + len -1 ;

	for ( ;start < end ;start++,end--){

		for (; start  < end && *start == ' '; start++)

			;

		if (*start <= 'Z')

			*start += 32;

		for (; end > start && *end == ' '; end--)

			;

		if (*end <= 'Z')

			*end += 32;

		if ( *start != *end){

			return *start;

		}

	}

	return 0;

}

int main(void){

	int result;

	result = Palindrome();

	printf("%d",  result);

	return 0;

}