Create abc.txt

Author: tajmuhammed123

abc.txt

@@ -0,0 +1,27 @@
+int main()
+{
+    FILE *ft;
+    char ch;
+    ft=fopen("abc.txt","r+");
+    if(ft==NULL)
+    {
+        printf("can not open target file\n");
+        exit(1);
+    }
+    while(1)
+    {
+        ch=fgetc(ft);
+        if(ch==EOF)
+        {
+            printf("done");
+            break;
+        }
+        if(ch=='i')
+        {
+            fputc('a',ft);
+        }
+    }
+    fclose(ft);
+    return 0;
+}
+As one can see that I want