Print string after deleting vowels - C Program

#include<string.h>
int main()
{
    char s[20];
    int len, i, j;
    printf("Enter String : ");
    gets(s);
    len=strlen(s);
    for(i=0; i<len; i++)
    {
        if(s[i]=='a' || s[i]=='e' || s[i]=='i' ||
        s[i]=='o' || s[i]=='u' || s[i]=='A' ||
        s[i]=='E' || s[i]=='I' || s[i]=='O' ||s[i]=='U')
        {
            for(j=i; j<len; j++)
            {
                s[j]=s[j+1];
            }
            len--;
        }
    }
    printf("\nString After Deleting Vowels : %s",s);
    return 0;
}