#define SIZE 80

void newsentence(char a[], char b[], char c[], int n, int k);
void array(int f, int s, int g, char buff[], char b[], char c[], int n, int k);

int main()
{
    char a[SIZE], b[SIZE], c[SIZE];
    int k;

    printf("Enter the sentence: ");
    gets(a);
    printf("nEnter the word which u want to replace: ");
    scanf("%s",b);
    printf("nEnter the new word: ");
    scanf("%s",c);

    int n =0;
    char *temp;
    temp =a;

    while((temp =strstr(temp,b))!= NULL){
        n++;
        temp++;
        k = strstr(temp,b)-b;
    }
    printf("The word appears %d times",n);

    newsentence(a,b,c,n,k);
}

void newsentence(char a[], char b[], char c[], int n, int k)
{
    int f, s, g;
    char buff;

    f=strlen(a);
    s=strlen(b);
    g=strlen(c);

    strcpy(buff,a);

    array(f,s,g, buff,b,c,n,k);
}
void array(int f, int s, int g, char buff[], char b[], char c[], int n, int k)
{
    int i,j;
    int q;
    q = k +s - 1;

    for(j = 0; k<=q ;k++, j++)
    {
        if(strcmp(buff[k],b[j])==0){
            strcmp(buff[k],c[i]);
        }
    }

    for(i = 0; i<SIZE;i++){
        printf("Yout new string is: %c",buff[i]);
    }
}