Palindromes identifier (exclude digits)

#include "stdio.h"
#include "stdlib.h"
#include "conio.h"
#include "iostream"

void delchar(char* str, char ch)
{
    if(str == 0 || *str == 0) return;

    char* ptr = str;
    while(*ptr != 0) if(*ptr == ch) break; else ptr++;

    while(1)
    {
        char c = *ptr;
        *ptr = ptr[1];
        ptr[1] = c;
        if(*ptr == 0) return; else ptr++;
    }
}

char* _strrev_(const char* str)
{
    char str_[1024];
    str_[strlen(str)] = 0;

    for(int i=strlen(str)-1, j=0;i>=0;i--,j++)
        str_[i] = str[j];

    return str_;
}

int main()
{
    char str[1024], strptr[1024];
    printf("Input palindhrom: \n");
    gets(str);

    for(int i=0;i<strlen(str);i++)
    {
        if(str[i] == 0) break;
        if(isupper(str[i]) || isdigit(str[i]))
            delchar(str, str[i]);
    }

    printf((strcmp(_strrev_(str), str) == 0 ? "Yes, this is palindromes:\n %s\n %s" : "No, this is not palindromes:\n %s\n %s"), str, _strrev_(str));

    getch();
}