Invalid characters replace using VIM

In my file due to some reasons some invalid characters are coming making it very huge file. Sample below of one line. I am not sure where these characters are coming from(I am using google drive online text editor). Please help me to find and replace and all and to avoid getting such characters? It is a file name of a zip file, however not sure how those weird characters came. This is a screenshot of a text file (containing the filenames of a directory). The filenames were obtained by running find . -maxdepth 1 -type f | sed 's/\.\///g'. I then saved this text file in google drive. When I open the file, I can see these characters: looks like ’ characters are converted to â€â„Â