/in/foo.c: In function 'bubbleSort':
/in/foo.c:5:21: error: 'str' undeclared (first use in this function); did you mean 'srt'?
    5 |      int len=strlen(str);
      |                     ^~~
      |                     srt
/in/foo.c:5:21: note: each undeclared identifier is reported only once for each function it appears in