CPT lab04-02

//main.c
#include<stdio.h>
#include<string.h>


char* find_space(char *s);
int main(){
    int i=0,len =0;
    char s[100],ch,copy[100],cc,*null=NULL;
    gets(copy); fflush(stdin);
    scanf("%c",&cc);
    len = strlen(copy);
    while(i<len){
        printf("%c\n",copy[i]);
        if(find_space(&copy[i]) != NULL){
            copy[i] = cc;
        }
        printf("%c\n",copy[i]);
        i++;
    }
    printf("\n");
    printf(copy);

    return 0;
}

char* find_space(char *s){
    printf("in f = %c\n",*s);
    char *null=NULL;
    if(*s == ' ') {
        printf("in if\n");
        return s;
    }else{
        printf("in else\n");
        return null;
    }
}